Beer keg?

definitely not because it isn't painted light blue as in HP....
damn, I can't even remember the full name of the airline. Oh just
remembed, America West. I used to be a UA 1K but now I prefer
to fly myself.

My guess is one of the hi-bypass turbo-fan type engines such
as on the 767. It's
not an 'oval' shape, so chances are it's not for the newer 737s.

correct on the 737 since it isn't oval shaped and it isn't of
the 737-300 low-bypass engines either. I doubt it is a 767 or 777
since those intakes are about the size of a 737 diameter. I don't
think it is a 747 nacelle either. I
presume it is from a US air carrier so you can rule out almost
every other manufacturer since it is bigger than a Regional Jet
intake.

Maybe it is a beer keg?

Gerald