GBS, as far as I can make out, the pilot says how much the flight will cost per seat. i.e plane rental is £100ph, it's a 2 seater, so they charge £50 per seat (with PIC already occupying one of the two seats). Wingly will then advertise that flight for, say £56, and take the 12% profit for themselves (not certain if it's 12%, but it does ring a bell).