Originally Posted by
rustypigeon
If you get an ATP in a single, you are only able to use your ATP priviledges in a single, which makes it basically a worthless rating. I am not aware of a single engine aircraft out there that requires an ATP.
Yes, you need an ATP MEL for airline purposes.
But I believe the Antonov AN-2 (one of the largest single engine airplanes) could theoretically carry more than enough pax to require an ATP. Not sure about Pilatus, etc.