Filing an ICAO flight plan is one of those tasks every pilot learns early and then rarely stops to double-check — until a rejected plan or a raised eyebrow from a briefer sends you back to the form. This guide walks through the ICAO flight plan form (known in the United States as FAA Form 7233-4) field by field, in plain language, so you can complete it accurately whether you fly VFR or IFR.
By the end you’ll understand what goes in each box, the codes that trip most pilots up, and the mistakes that most often get a plan bounced.
A quick note before we start. This is an educational guide, not an official document. Filing requirements differ between States and authorities, and the definitive references are ICAO Doc 4444, your national AIP, and — for US pilots — the FAA Aeronautical Information Manual (AIM), paragraph 5-1-9. Always confirm against the source that applies to your flight.
What is an ICAO flight plan (and who needs one)?
An ICAO flight plan is a standardized message that tells air traffic services what you intend to do: who you are, what you’re flying, where you’re going, and how. Its purpose is to let ATC provide separation and traffic information, and to trigger search and rescue if you fail to arrive.
The current format has been the global standard since November 2012, and most States now expect flight plans in ICAO format. In the US, the FAA has been phasing out the older domestic format, so learning the ICAO version is worthwhile even for flights that don’t yet strictly require it.
You’ll typically file a flight plan for IFR flights, for flights crossing international borders, and often for VFR flights where local rules require it or where you simply want the safety net of an activated plan.
Before you touch the form: plan the flight first
The form is not the plan — it’s the summary of a plan you’ve already made. Before filling a single box you should already know your route, cruising level and speed, fuel and endurance, alternates, and estimated timings. Trying to build the flight inside the form is where errors creep in.
The form at a glance: white boxes vs. shaded boxes
The ICAO form is divided into numbered items. The white boxes are yours — you, the pilot or dispatcher, complete them. The shaded areas are for ATS and communications staff and you leave them alone. Sticking exactly to the prescribed format and abbreviations matters here; the message is machine-processed, and a stray character can get it rejected.
Here’s the walkthrough of the fields you actually complete.
Field-by-field walkthrough
Item 7 — Aircraft Identification
Enter up to seven characters, no hyphens or symbols. Use either your aircraft registration (for example GABCD or N737DK) or the ICAO airline designator followed by the flight number (for example BAW11). Whatever you enter here is the call sign you’ll be worked under, so it must match exactly.
Item 8 — Flight Rules and Type of Flight
Flight rules is a single letter:
I— the whole flight is IFRV— the whole flight is VFRY— IFR first, then changing to VFR en routeZ— VFR first, then changing to IFR en route
If you use Y or Z, you’ll specify the change point later in the route (Item 15).
Type of flight is also a single letter: S for scheduled air service, N for non-scheduled air transport, G for general aviation, M for military, and X for anything that fits none of these (you then explain it in Item 18).
Item 9 — Number, Type of Aircraft and Wake Turbulence Category
Give the number of aircraft only if it’s a formation (otherwise leave it blank). Enter the ICAO type designator — C172, PA28, B738, and so on. If your aircraft has no designator, enter ZZZZ and describe it in Item 18 using TYP/.
The wake turbulence category is a single letter based on maximum take-off mass: L for light, M for medium, H for heavy, and J for super (the A380 and An-225).
Item 10 — Equipment and Capabilities
This is the field that catches the most pilots, and it’s the reason a good template earns its keep. It has two parts.
10a — COM / NAV / approach aid equipment. Enter N if you carry none, S for the standard fit (which stands for VHF radio, VOR and ILS), or list the individual letters for what you actually have — for example G for GNSS. You combine S with any extra letters as needed.
10b — Surveillance equipment. This describes your transponder and ADS-B capability — for instance C for a Mode A/C transponder, S for basic Mode S, with additional codes for Mode S variants and ADS-B out. Enter N only if you truly carry nothing.
Get this field wrong and you may be denied the routings or approaches your aircraft is actually equipped for. It’s worth building a reference sheet for your own aircraft so you copy the exact string every time rather than reconstructing it under pressure.
This is exactly the field our ICAO Flight Plan Form for Excel gives a dedicated page and reference sheet for, so you enter it correctly every time.
Item 13 — Departure Aerodrome and Time
Enter the four-letter ICAO location indicator of your departure aerodrome (for example EGLL) followed by your estimated off-block time (EOBT) as four digits in UTC. If the aerodrome has no indicator, use ZZZZ and give the details in Item 18 with DEP/.
Item 15 — Route
Start with your cruising speed — N followed by four digits for knots (for example N0090), or M followed by digits for Mach. Then your cruising level — F plus three digits for a flight level (F350), A plus three digits for an altitude in hundreds of feet, or VFR for a VFR cruise. Then the route itself: DCT for direct legs, airway designators, and named waypoints in the correct order. If you’re flying Y or Z rules, mark the point where the flight rules change here.
Item 16 — Destination, Total EET and Alternates
Enter the four-letter indicator of your destination, your total estimated elapsed time as four digits (hours and minutes), and then your alternate aerodrome — and a second alternate if you’re carrying one.
Item 18 — Other Information
This is the catch-all for anything the coded fields can’t express: DOF/ for the date of flight, OPR/ for the operator, PBN/ for navigation capability, RMK/ for remarks, and the DEP/ or DEST/ details if you used ZZZZ earlier. If there’s genuinely nothing to add, enter 0 (zero) — not blank.
Item 19 — Supplementary Information
Item 19 covers endurance (fuel in hours and minutes), persons on board, emergency and survival equipment, dinghies, aircraft colour and markings, and the name of the pilot-in-command.
The important thing to understand: Item 19 is not transmitted in the flight plan message. It stays with the office you filed through and is used to launch search and rescue if you go missing. That’s precisely why it must be accurate — it’s the information that helps someone find you.
A simple worked example
Imagine a VFR cross-country in a Cessna 172 registered GABCD, departing at 09:00 UTC:
- Item 7:
GABCD - Item 8:
V(VFR) /G(general aviation) - Item 9:
C172/L(light) - Item 10: your actual COM/NAV string and transponder code
- Item 13: departure indicator +
0900 - Item 15:
N0090VFRthen your route - Item 16: destination indicator, total EET, alternate
- Item 18:
DOF/and any remarks, or0 - Item 19: endurance, persons on board, equipment, PIC name
Working from a fully completed example like this — rather than a blank form — is the single fastest way to fill the plan correctly, which is why a reference example is worth keeping beside you.
Common mistakes to avoid
- Leaving Item 18 blank. If there’s nothing to add, the entry is
0, not empty. - Guessing Item 10. Reconstructing your equipment string from memory each time invites errors. Copy it from a fixed reference for your aircraft.
- Local time instead of UTC. All times on the form are UTC.
- Times as anything but four digits.
0900, not9:00or900. - Symbols in the aircraft ID. No hyphens or spaces in Item 7.
- Skipping the alternate. Item 16 usually needs one; don’t leave it off by habit.
How to file it
Once complete, a flight plan can be filed by phone with a briefing service, online through an authorized provider, or in person at a flight service or ATS reporting office, depending on your country. File in good time before your EOBT, and remember to close or cancel the plan on arrival — an un-closed plan can trigger an unnecessary search.
Frequently asked questions
Is the ICAO flight plan the same as FAA Form 7233-4? Yes. Form 7233-4 is the FAA’s version of the international ICAO flight plan format.
Do I need to file a flight plan for a VFR flight? It depends on where you fly. Some States and airspace require it; in many places a VFR plan is optional but strongly recommended for the search-and-rescue coverage it provides.
What times go on the form — local or UTC? Always UTC, entered as four digits.
Where’s the authoritative reference? ICAO Doc 4444 and your national AIP. US pilots can also consult AIM paragraph 5-1-9 and the FAA’s ICAO flight plan guidance.
Make filing faster and error-free
If you’d rather not rebuild the form from scratch every time, our ICAO Flight Plan Form for Excel gives you an intuitive layout, embedded input guides, a dedicated page for Item 10, a reference sheet of ICAO codes, and a fully completed example to work from. One-time purchase, no subscription — take a look here.
This article is for educational purposes. Always verify flight-planning requirements against ICAO Doc 4444, your national AIP, and the authority responsible for your flight.
