+1
Yes, GB, if you liked Airplane you might appreciate The Big Bus.
Granted, it's not as non-stop funny as Airplane, but it is the same type of humor.
It gets a little more into the characters of the crew and the wacky passengers (similar to the way the Airport movies did).
But it's wall to wall silliness - the bus has it's own piano bar, Captain's dining room, swimming pool and even a bowling alley. The on-board tumultuous romance between Stockard Channing and Joseph Bologna is classic. The cast reads like a who's-who of 70's Hollywood bit actors.
One big difference is it's about a new technology - the bus is making it's maiden voyage and it's nuclear powered (so it's almost a little bit sci-fi in that respect).
I'm not going to guarantee anything - some people love it (which is why it's a "cult" classic) others think the humor is groan-worthy (and they're sore from groaning by the end) and some can't stand it. What it does well is spoof a lot of different genres within the overall disaster film spoof. The funniest thing is, this came out when I was about 11, and I didn't really "get" or care about the comedy, I just thought the bus was COOL!
If you're in the mood for something very silly and don't watch it with a critical eye, try to compare it to Airplane by rating it's jokes-per-minute, or (God forbid) take it seriously... then you might enjoy it.