Now I do have a valid theory involving the use of gravitational forces to maintain cruise equilibrium greatly reducing fuel burn requirements. But as with most of my theories (e.g. darkness, time, yellow jelly etc), it is best explained over a few beers in an airline lounge.
Join Australian Frequent Flyer (AFF) for free and unlock insider tips, exclusive deals, and global meetups with 65,000+ frequent flyers.AFF members can also access our Frequent Flyer Training courses, and upgrade to Fast-track your way to expert traveller status and unlock even more exclusive discounts!