Blarg! Hit submit too soon! Anyway...
Sort of. We had our 20 month old with us. We got a bulkhead seat so we had lots of leg room. DD spent a lot of time on the floor watching Old School Sesame Street on our then DVD player.
Bulkhead. See what you can do for extra leg room.
Same thing when we went again with DD #2. She was just a wee, wee thing, so we went bulkead and the airline supplied us with one of those baby seats that strapped onto a table in front of us... Had to take her out during turbulence, which sucked, because it woke her up. (But safety first.

)
Call the airline and see what's available.