How is PlaneWX different from my EFB or aviationweather.gov?

Your EFB is excellent for charts, filing, and day-of flying. Aviationweather.gov and Flight Service (including 1800WXBRIEF) give you official weather products. PlaneWX sits beside those tools. It does not replace them. What PlaneWX adds is decision support days out: a WX Score matched to your aircraft and personal minimums, a dynamic FRAT on the FAA PAVE framework, and mentors who see the same briefing you see. You can also share a flight plan into PlaneWX from a supported EFB. You stay PIC. Charts, filing, and official sources stay where they belong.

Is the briefing accurate?

Your briefing uses the same official observations and forecasts every pilot relies on: METARs, TAFs, PIREPs, SIGMETs and model guidance. It can only be as accurate as those forecasts, and every forecast carries some uncertainty. Every weather briefing, from any provider, also has the same built-in limit. It describes one departure time, one route, one altitude and one arrival time. Real flights change. You leave late, get rerouted, or get assigned a different altitude, and each change puts you in weather the briefing didn't look at. That's why PlaneWX can keep updating your briefing for monitored flights as the forecast changes, and why your decision-making continues in the air.

How can I make my briefing more accurate?

Enter the flight the way you'll really fly it: a realistic departure time, the route you expect to file or be cleared, your planned altitude, and the right aircraft profile. If any of those change, update the trip and brief again. Check again close to departure, when the forecasts are freshest.

Yes, in specific places. Weather reports, forecasts, model data and NOTAMs are fetched and decoded by code. AI reads forecaster discussions and writes the plain-language briefing, the hazard summary and most section ratings. It also proposes a starting WX Score and some deductions, such as for convection. Ceiling and visibility are always scored by code. Within 12 hours of departure, your personal minimums and aircraft limits are checked by rule-based code, not the AI. Further out, AI also helps weigh icing and turbulence against your limits. You always make the final call.

What is the WX Score?

The WX Score is a 0-100% metric calculated against YOUR personal minimums and your specific aircraft, not generic VFR/IFR categories. It tells you, in a single number, how well conditions are expected to match your standards. Every deduction is transparent and explained.

What is the PAVE framework?

PAVE is the FAA risk framework: Pilot, Aircraft, enVironment, and External pressures. It is the structure behind a serious preflight risk assessment, not a weather product by itself. We walk through it in plain language in our PAVE risk assessment guide. PlaneWX FRAT uses that same framework as a living sit-down assessment near departure. See how PlaneWX FRAT works, including how the briefing and airport context feed the enVironment side.

How far in advance can PlaneWX forecast weather?

PlaneWX provides weather intelligence from 14 days out through departure. Confidence improves as your flight approaches. We are transparent about uncertainty at every time horizon.

What is the mentor system?

PlaneWX connects you with experienced pilots who can review your full briefing (WX Score, aircraft profile, personal minimums) and offer a second set of eyes grounded in shared data, not guesswork. Mentor sits alongside the risk-management loop when you want it.

Is there a free plan?

Yes. Free forever includes full-quality briefings. We limit how much you can use PlaneWX, not how good the analysis is. Details on plans and what each tier includes are in PlaneWX Plans help.

What's the difference between Casual, Pro, and Pro Plus?

Casual is for pilots who fly a few times a month and want auto-monitoring. Pro raises limits and automation. Pro Plus adds Ground Protection, Auto-Brief, Pre-Flight Text, briefed fuel stops, and Labs. Compare current limits and features in Plans help, or start from the pricing section on this page. Personal minimums still drive the WX Score on every plan. If you are setting those for the first time, see personal minimums for weather planning.

What happens after the 14-day free trial?

You keep access on Free, or choose Casual, Pro, or Pro Plus. No card is required to start the trial. Plan details stay in Plans help.

Why and How to Cross-Check Your Pilot Weather Briefing

October 14, 2026

I built PlaneWX and I still don't trust any one weather briefing on its own. That includes mine.

I say this in talks and people are sometimes surprised. But it's the honest answer. Every pilot weather briefing, whether it comes from Flight Service, ForeFlight, or PlaneWX, is one take on the data at one moment in time. Models update. TAFs get amended. A PIREP comes in that nobody saw coming. A NOTAM closes the runway you were counting on.

When two or three sources agree, I'm more confident. When they don't, that's the most useful thing I learn all day.

Why one pilot weather briefing isn't enough

The FAA's preflight rule, 14 CFR 91.103, says the pilot in command must "become familiar with all available information concerning that flight." For IFR flights, or flights not in the vicinity of an airport, that includes weather reports and forecasts. Note the word "all." It doesn't name one source, and no single source covers everything.

The FAA also has a word of caution about third-party weather. In the Aeronautical Information Publication (GEN 3.5), it tells pilots using a vendor's weather to look at what kind of product it is, when it was issued and how long it's valid, and whether it's relevant to the flight. It also says to be careful with unfamiliar products and to call Flight Service when in doubt. Even though we pull official weather products, PlaneWX is a third-party product. I want you looking at it the same way.

That's education, not legal advice. Your CFI or the FAA is the place for questions about your own situation.

Sources disagree for normal reasons. They run on different model cycles, they refresh at different times, and they summarize the same data in different ways. I wrote more about that in why weather sources disagree.

How I cross-checked by hand

Before we built the connector, I did all of this by hand.

Roughly, it looked like this:

METARs and TAFs for departure, destination, alternates and fields along the route. Is the field actually doing what the TAF said it would? (Primers: METAR, TAF.)
Aviation Weather Center products. G-AIRMETs for IFR, icing and turbulence, plus SIGMETs, convective SIGMETs and the icing and turbulence guidance.
PIREPs. The only reports from someone actually up there. (PIREP primer.)
NOTAMs and TFRs. Runways, approaches, fuel, airspace.
ATIS or AWOS right before I go, and again en route.
Then compare. Does my briefing match all of that? If the briefing looks good but a fresh PIREP reports icing near my altitude, I want to know why.

It works. It's also slow. Lots of tabs, lots of timestamps, and it's easy to skip a step when you're tired or rushed. That's exactly when it matters most. If you're building your own list of sources, see how to build a weather stack and the best pilot weather apps.

Cross-checking a ForeFlight weather briefing, or a PlaneWX briefing, with AI

This is where things have gotten a lot easier for me.

PlaneWX now has an AI assistant connector that works in Claude, Grok, ChatGPT and Gemini. It's built on MCP, the standard way AI assistants connect to outside apps. It's a Pro Plus beta under PlaneWX Labs, and Pro Plus trials include it too.

Once it's connected, you can ask about a saved trip. The assistant reads the same stored briefing and WX Score you see in the app, including terminal weather, en route hazards, cautions and the NOTAM summary. It won't re-score unless you ask it to.

Then ask it to cross-check that briefing against other sources it can reach, like current METARs, TAFs, G-AIRMETs and PIREPs. ForeFlight has its own AI Connector, and it works in ChatGPT and Claude. So in either of those you can connect both and ask something like:

"Compare the ForeFlight briefing with PlaneWX for my KGDJ to 8V2 flight and list where they disagree."

A few other prompts that work well:

"Read my PlaneWX briefing for my next trip and check it against current METARs, TAFs, G-AIRMETs and PIREPs. List anything that disagrees, with the source and time."
"What has changed since this briefing was generated?"
"Which items in this briefing should I verify myself before I go?"
"Generate a weather briefing using ForeFlight and compare it side by side with my PlaneWX weather briefing."

What you get back is a short list of disagreements, like a TAF amended after the briefing ran, an icing G-AIRMET the briefing treats differently, or a NOTAM worth a second look. That turns twenty minutes of tab-flipping into a list of things to go check.

Now the honest part. The assistant only knows what its tools can reach. It can misread a product, miss one, or work from data that's out of date. And the connector is a beta. Treat every flag as a lead, then go check it at the source. It doesn't replace your own look at NOTAMs, ATIS and PIREPs, or a call to Flight Service. And it doesn't make the decision. Neither does PlaneWX. PlaneWX never recommends GO or NO-GO.

Used that way, PlaneWX helps pilots meet 14 CFR 91.103 by putting more of the available information in front of you, faster. Meeting the rule, and making the call, is still the PIC's job. More on the AI side in can AI improve preflight weather decisions?, and on reading the score in how to use the WX Score.

Claude Cross-Checked My PlaneWX Briefing Against ForeFlight: Here's What It Caught — Watch: Claude cross-checks a PlaneWX briefing against ForeFlight.

One briefing is never enough: what the PlaneWX connector can do in a cross-check

The whole point of the connector, for me, is making the second and third look cheap enough that you actually do it. Here is what it can do today, from the connector help page:

Read the briefing you already have. list_trips and get_trip_briefing bring back your saved trips and the same stored briefing and WX Score the app shows, without scoring again.
Score a fresh look on request. score_trip scores a route and time you ask about, and find_departure_windows looks for candidate departure times. These count toward your daily scoring runs; reading saved trips and briefings does not.
Log a mismatch. When you or the assistant spot a factual difference between PlaneWX and another briefing, report_discrepancy sends us a short note. It doesn't change any score or stored briefing. It just tells us where to look.

Here's what it doesn't do. There is no ForeFlight integration inside PlaneWX. PlaneWX and ForeFlight are separate connectors, and you bring both into the same chat in your AI assistant. One tip from our own setup page: if you compare against a ForeFlight briefing, do it for flights departing within about 2 hours. ForeFlight briefings are built for near-term departures, so a comparison made hours in advance won't be accurate.

And the same rule applies to the connector as to everything else here. It's one more source to cross-check, not the last word. NOTAMs, ATIS, PIREPs, an official briefing and your own judgment are still part of every decision.

Where cross-checking fits: Brief, Assess, Decide, Debrief

Brief. Cross-checking is part of the brief, not an extra step.
Assess. Disagreement between sources is information. Uncertainty belongs in your FRAT, under the enVironment part of the FAA's PAVE framework.
Decide. You make the call, weighing NOTAMs, ATIS, PIREPs, every other source, and your own judgment. Staying home is a legitimate outcome.
Debrief. After you land, compare what you saw with what each source said. Over time you learn which sources to lean on where you fly.

Common questions

How do pilots get weather briefings?

Most use some mix of Flight Service (1-800-WX-BRIEF or 1800wxbrief.com), an EFB like ForeFlight, and self-briefing from AviationWeather.gov. Our primer on weather briefing types covers standard, abbreviated and outlook briefings. If you want more help looking past 24 hours, see our advanced pilot weather briefing guide.

Is 1800wxbrief a Flight Service Station?

Yes. 1800wxbrief.com is the online portal for FAA Flight Service in the lower 48, run by Leidos. Here's how I use it side by side with PlaneWX.

Is a ForeFlight briefing enough on its own?

My take: no single briefing should stand alone, including ForeFlight's and including PlaneWX. Check it against at least one other source and the raw reports.

How do I cross-check my weather briefing against another source?

Compare TAFs with current METARs, read the G-AIRMETs and PIREPs for your route, check NOTAMs and ATIS, and note anything that doesn't match. You can do it by hand or have an AI assistant with the PlaneWX connector make the first list for you. Then you verify.

Can I use an AI assistant to compare my ForeFlight briefing with PlaneWX?

The PlaneWX connector works in Claude, Grok, ChatGPT and Gemini. ForeFlight's AI Connector works in ChatGPT and Claude. So ChatGPT and Claude are the places to have both in the same chat today.

Try it

New PlaneWX accounts start with a 14-day Pro Plus trial. If you're on Casual or Pro, you can start a Pro Plus trial yourself on the web under Profile, Subscription. Trials include 12 scored briefings a day through the connector. Reading your saved trips and briefings doesn't count against that.

Turn it on under Profile, Preferences, PlaneWX Labs, then add the connector in Claude, Grok, ChatGPT or Gemini. Setup steps are here: Connect PlaneWX to Claude, Grok, ChatGPT and Gemini.

Then cross-check your next briefing. Mine included.

Safe flying!
Mark