We've all been there - you arrive for a flight way ahead of time, only to spend an annoyingly long time sat in the departures lounge eating over-priced airport snacks.
But which UK airport do you reckon is the worst offender for delays? Well, according to new data, it's *drum roll*...London Gatwick.
The average delay per flight was higher at the West Sussex airport - 28 miles south of London - than any other in the country.
Information from the Civil Aviation Authority analysed by the BBC showed that from January 2015 to March 2016, passengers were delayed by an average of 18 minutes at Gatwick.
By comparison, the average delay was around 14 minutes at Luton, Manchester and Glasgow - and 13 at Heathrow.
The flight in the UK most troubled by delays was a Pakistan International Airlines flight from Manchester to New York's John F Kennedy Airport - it was late on eight out of 10 recorded flights in 2015 and delayed by an average of 88 minutes.
A spokeswoman for Gatwick Airport told the BBC: "We regret any delays our passengers experience however several incidents beyond Gatwick's control influenced the airport's performance during this period, including numerous air traffic control strikes across European airspace, impacting the airport's whole flight schedule including our long haul routes.
"Gatwick has more flights to Europe than any UK airport and can therefore be impacted disproportionately by events on the continent."