Revealing the drink in a blog, These Gold Wings, a crew member labelled diet coke as the most hated drink because it takes too long to pour.
The flight attendant who goes by the name of Jet said: "As you may know, the aircraft cabin is not pressurised to sea level, but rather to the equivalent of about seven or eight thousand feet."
"This means some passengers might feel a little light headed or that alcohol affects them almost twice as much as it would on the ground.
“It also means soft drinks foam up a lot more when poured out of a can, and the worst culprit for this is Diet Coke — I literally have to sit and wait for the bubbles to fall before I can continue pouring.
“If all 3 passengers ask for Diet Coke I’ll often get them started, take another three drink orders, serve those, and then finish the Diet Cokes.”