A/N: Slightly AU. Spoilers for anything up to season 8-ish, I think. Enjoy, pals!
Sam and Dean needed to get across the country, fast, in order to retrieve an ingredient for a potion that they had discovered in an old tome.
"Bobby said that it is supposed to help contain Purgatory souls if we can't get it back the way Cass took them out," explained Dean, clutching his armrest with one hand and a silver flask in the other. He took a sip, and then offered it to Sam.
Sam waved a hand in way of saying "no thanks."
Dean shrugged, taking another swig.
There was a "beep" of the overhead communication line and Sam tilted his head to listen to the message.
What he did not expect, however, was for Lucifer to begin speaking.
"Hello, ladies and gents, humans and hunters. Thank you for choosing Satan Airways."
Sam tensed.
"Please remember to buckle up because it is always going to be a bumpy ride when I am riding co-pilot. Refer to Sam Winchester for any questions about directions to Hell." He paused.
Just when Sam wondered if it was over, Lucifer added, "And remember: always take the highway to Hell."
The comm. clicked off.
Happy that Lucifer had shut up, but now having the added concern of imagining the plane crashing because of Satan flying shotgun, Sam looked over at his brother. He snatched the flask from Dean and gulped down all of the remaining alcohol. He returned the empty bottle to a pissed-looking Dean.
"Better?" the elder Winchester inquired sarcastically.
Sam nodded. "Oh, yeah."
The rest of the flight went by rather uneventfully, with Dean humming AC/DC as he tried to calm himself without alcohol and a drunken Sam muttering things about "spooning" and "flights to Vietnam."