Alec Baldwin on Saturday Night Live: I'm an 'American Treasure'

Alec Baldwin took even more unrelenting shots at American Airlines last night -- mocking his recent cell phone debacle on "Saturday Night Live" ... even referring to himself as an "American treasure."

Among the awesomeness ... Alec -- pretending to be the pilot of his ill-fated flight -- explained why he slammed the lavatory door so loudly during his alleged standoff with a flight attendant ... claiming, "Words with Friends" can be "frustrating."