plane tickets – Qatar economy booking classes

Qatar Airways advertises "fare families" to facilitate the viewing of what is allowed, authorized for a surcharge or prohibited with a special fare:

  • Promotional price
  • Saver price
  • Price of value
  • Flexi rate

But which reservation class code reserves in what types of tariff? The economy class fare codes are B, H, Y, V, L, K, M, O, T, N, Q, S.