B - Economy/Coach – Usually an upgradable fare to Business. C - Business Class. D - Business Class Discounted. E - Shuttle Service (no reservation allowed) or Economy/Coach Discounted. F - First Class.
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2.1 When a flight experiences a significant delay (i.e. 24H) into the next day, there is potential for two FPLs to exist with the same callsign. To alleviate this, airlines might append the suffix “D” in Item 7 of the FPL after the flight identification.
The ICAO phonetic alphabet has assigned the 26 code words to the 26 letters of the English alphabet in alphabetical order: Alfa, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu.
O&D: Short for “origin and destination” – No connection between points. Otherwise known as a flight leg, or segment. This used in managing travel booking and fulfilment. Also used in air operations related to arrivals and departures.
Four-digit numbers in the range 3000 to 5999 typically represent regional affiliate flights, while numbers larger than 6000 are generally codeshare numbers for flights operated by different airlines or even railways.
Airlines can schedule multiple flights with the same flight number on the same day (sometimes on the same route and sometimes on different flight segments). This varies by carrier.
Check with your flight itinerary on the airline's website. If the type of aircraft isn't listed on your boarding pass, near the flight number, look for a link to trip “details” and you'll usually find the aircraft type there. Visit a flight tracker website.
Codeshare. In a codeshare, airlines share their aircraft with others, resulting in the flight having more than one flight number on the same sector, and either the same or different flight numbers on joined sectors.
Occasionally, aircraft with a seating structure of 2+2 may letter the seats as ACDF to keep with the standard of A/F being window and C/D being aisle on short-haul aircraft (which generally have 3+3 seats).