Bid for an enhance: Some airlines let you bid for an improve to business class. You can post a bid to the enhance and if it’s acknowledged, you’ll be upgraded at a reduced rate. Looking to fly business class for 75% off what’s publicly available? I’ve bought you covered! After https://businessflightshop.co.uk/blog/why-should-shouldnt-you-not-upgrade-to-first-class-or-business-class/