Frequent Flyer Programme
The close cooperation between KLM and Air France is evidenced by their joint Flying Blue loyalty programme. You earn points for each flight, which can then be redeemed for a range of benefits such as priority boarding or free upgrades. You enter the program as an Explorer, and as your points increase, you'll move up to Silver and later Gold status. The highest possible status is Platinum. Anyone can join the Flying Blue programme for free.

KLM Royal Dutch Airlines