A flight departing from Pittsburgh International Airport was delayed on Wednesday after thousands of honey bees landed on the aircraft.
Crew members were preparing for take off when the discovery was made.
The bees swooped down on one of the airplane's wings -- and decided to stay there.
Honey bees are a protected species, so a master beekeeper had to be called in to remove the would-be hitchhikers.
A swarm occurs when a queen leaves her colony with a portion of her worker bees in search of a new home.
She resides in the centre of her swarm, which can contain as many as 30,000 bees.
While a swarm appears intimidating, honey bees are docile creatures that will only attack when provoked.
It took about 20 minutes to coax the unwanted guests off the airplane and send the flight on its way.