Going to the toilet on a plane is never the best part of a trip on an aircraft - especially if your business in there involves a No 2.
They're tiny, for starters, and there's often someone standing right outside - so privacy isn't exactly at a premium.
However, help is at hand, because a former flight attendant has revealed the perfect times for attending to bowel movements mid-flight, the Daily Mail reports.
Erika Roth told Mel magazine that just after the seatbelt sign comes off and just before drinks service begins are the two most ideal slots.
She said that by going at these times you should get up to 10 minutes peace and quiet, but you'll get a knock at the door after 20 minutes.