In a television version, there is added footage during the New York- Chicago/Wichita flight where Del and Neal try to eat in flight.
Although it's not included in the theatrical or the network cuts, a shot of Del Griffith brushing his teeth was included on ads for the network version.
Some network TV versions include an alternate version of the scene where Neil confronts the car rental lady. This version (which has presumably been reshot) removes all the four-letter words from the scene.
TV version show a scene during the first plane ride where they order dinner. Del talks about which he meals he orders according to what airline he's flying. Neal's dinner is lasagna, which due to various delays, has been reheated several times. Unsatisfied, Neal gives the lasagna and the rest of his food, to Del, who shares it with the old man next to Neal. Neal keeps the brownie with his meal, but a lady in front of them throws her hair back, disgusting Neal, so he gives the brownie to Del, who again shares it with the old guy giving him "the bigger half."