Originally posted by Thomas
First class codes
* A, F, P, R, Z
On domestic flights, F commonly indicates first class on a two-cabin plane. If a three-cabin aircraft is used, P (for "premium") may be used to distinguish the higher level of service in first class. The R code indicated supersonic transport and is no longer used with the retirement of the Concorde. The A and Z codes may indicate a first class ticket whose fare is reduced due to restrictions on refunds, advance reservation requirements, or other terms.
The codes in short:
* A = First Class Discounted,
* F = First Class,
* P = First Class Premium,
* R = Supersonic (concorde),
* Z = Business Class Discounted
* (a lowercase "n" after any class code indicates Night Service)
