Originally Posted by
ElJudioErrante
the way to know the booking class is look at the reservation on the airline(or travel agency eg Amadeus) screen At ticket office/transfer desk EK (or other airline) will if they're in a good mood print out the short version of the reservation. The letter after the flight no.denotes the booking class e.g.EK 123S.
Looking at the fare construction might just be easier and can be done without getting out of the armchair.