Flying Blue is though currenty deserving your attention not only for hotel bookings, but also for car rentals: Renting a car from partner Enterprise by March 31 lets you earn double miles, what means 8 miles per EUR spent. Assuming a redemption value of 1 Euro cent per mile as minimum, you quickly understand the return of that promotion – which even increases if you manage to use your miles to get a better value out of them. If you have though already switched your SkyTeam program to Virgin Atlantic’s Flying Club, you can benefit of a similarly rewarding deal with Hertz: Booking by February 29 for rentals until May 31 lets you earn 10 miles per GBP spent.