Most flights overbook seats to avoid losses from no show. But, they still charge passengers for not showing up.
Captain and the copilot of the plane are fed differently to avoid issue that might arise due to food poisoning.
so, that one of them can always take care of the plane.
All minor failures to a plane are not immediately repaired
To get cheaper Air tickets buy them on Tuesdays, Wednesdays and Saturdays
Containers used to serve coffee or tea are not generally washed every morning
Due to low salaries of station agents they are least bothered to wash them regularly.
To get maximum passengers, airlines add more seats resulting in reduced Leg Space