Link: How do airlines decide who gets those coveted upgrades?
Link: The smooth-talker’s guide to upgrades
Link: The Upgrade Game: A Real Catch-22 for Airlines
Link: Upgrade FAQs: insideflyer.com
Link: 10 Ways to Score a Free Flight Upgrade: realfoodtraveler.com
Link: Upgrade Tips from the Trenches
Link: Scamming an Upgrade
Link: Unlimited Complimentary Delta Medallion Upgrades