At the end of a tour, the Hart's were set to go back to Calgary from Niagara falls. While it appeared, that Bret and Owen have to catch a later flight, Davey was grinning because he was able to leave the show early and to catch the last flight that night to Calgary.

Owen and Bret had their match pretty late that night, that's why they probably would likely miss the flight.
And Davey kept running it in.
After the show, Bret and Owen hurried up to catch their flight at 1am.
Luckily for them, the clerk was a huge wrestling fan and gave them first class tickets in exchange for some pictures and autographs.
She too made it easy for them, to go through security.
Owen and Bret then where in an empty plane in first class with Davey way back in coach.

A steward asked them if they wanted to let their friend into first class.
As Owen and Bret realized that davey was alone back there, they told her not to and saying he was a 'wannabe' wrestler.
But they let him up and talk for a bit.
They made out a signal when they wanted him to go back.

Owen then walked up to Davey and offered him a first class seat.
After a while, Bret signaled to the steward to sent Davey back to coach.
When the steward did just that, Owen cracked and Davey blew the steward off.
The steward kept pushing it and Davey soon realized that he got pranked.
Finally Davey snapped and said "F*uck you, f*ck you and f*ck you!", to the other three.