For an article I'm curious or there are still big differences between FFP's in earning and spending miles for tickets. I intend to make a comparison between 10 carriers and the main question is: how many miles you need to get a free ticket. Can anyone help me out there?
(the airliners are: KLM, Lufthansa, BA, Alitalia, Air France, SAS, SIA, TWA, AA and JAL)