Re: episodes that are part of two different TV series
^ Add Wings to the Cheers, Frasier listing. Frasier had a layover at Sandpiper Air.
Ah! That's right he did! I forgot about that. Wings was made by many of the same writers/producers as Frasier most notably Chirstopher "Not the Doc Brown One" Lloyd.
Frasier also exsists in the Dr. Pepper universe.
Just because it's futuristic doesn't mean it's practical.