Barbershop quartet serenades passengers on delayed flight

Sweet surprise or or an in-flight nightmare?

After boarding their US Airways flight to New Orleans, passengers were stuck on the tarmac in Indianapolis for a whopping five hours.

Flight attendant Keri Mann, knowing passengers were growing restless with the maintenance delay, decided to recruit some morale-boosting help.

She asked Port City Sound, a Maine barbershop quartet onboard, to serenade the plane.

They did, cheering up their fellow passengers with an impromptu performance.

“Our flight to New Orleans today was delayed for maintenance AFTER we had boarded. I started talking to the passengers and realized we had a barbershop quartet in our presence. I asked them to sing and most of the passengers began video taping! It was such a great moment… The mood changed and our passengers were awesome for the whole 5 hours they were on the plane!” Mann wrote on Facebook.

In May 2012, Toronto’s Lemon Bucket Orkestra grabbed their instruments and broke out into song during a 20-minute delay on the tarmac at Pearson International Airport.

Music might lift spirits, but so does pizza.

In May of 2013, after severe weather grounded an Atlanta-bound plane in Tennessee for several hours, Pizza Hut delivered dozens of hot pizzas to the passengers in the parked plane.

"Yeah, it definitely put a smile on everyone’s face when we saw them bring 30 pizzas on the plane," passenger Ryan Wood told NBC News.