Benediction

Arriving in Chicago from Pittsburgh, the cabin attendant made her prepare-to-deplane spiel, but she ended not with the usual “Thank you for flying United” but:
“May the doors of Heaven open and abundant blessings rain upon you.”
I was taken aback. Is that in the airline script? How did she sneak it in? Where did the phrasing come from; it sounds like it could be almost any religion.