Hong Kong based Cathay Pacific Airways has produced an excellent series of videos showing a typical work day of one of their ground staff at Hong Kong International Airport.
These staff work ten hours each day, often commencing work at 5am (which many a frequent flier day-tripper will realise, requires them to get up well before 4am). While we can catch up on our sleep during the flight, these staffers need to keep working performing many different tasks, requiring many different skills and abilities, many needed to be done with a smile. Try smiling 250 times and then check how sore your facial muscles are.
So enjoy the video and empathise with them the next time you get the urge to vent your anger or frustration at them.