Derry Air
Wikisimpsons - The Simpsons Wiki
Derry Air is an airline based in Ireland. The Simpson family used the airline to travel to Ireland.
History
When Grampa told the Simpsons that O'Flanagan's was in Ireland, Homer was shocked and then angry because Grampa made them look up at a Derry Air plane.
The family later travelled to Ireland on a Derry Air plane.
Behind the Laughter
The name is a pun on the French word "derrière", meaning "butt". Derry is a city in Northern Ireland.