For most travellers, the way to win yourself that free first class ticket is by collecting lots of frequent flyer miles and then redeeming these in the future against a free flight upgrade. (headedabroad.com)
And I knew the system which enabled me to consistently score flight upgrades, book the cheapest seats and quickly navigate security. (mamanista.com)
Perhaps that's why the gate agent on my last flight upgraded my seat! (stylemba.com)