I was in Houston Hobby Airport back during the mess at Waco and I saw an Asian woman with the FLATTEST FACE I had ever seen. Literally her head looked like a bowl covered in plastic wrap painted in the shape of a human face standing up on a small framed woman's body.
The strange thing I believe is she is a representative from a small village of people somewhere in the world, where everyone there has similar odd features. I never thought Alien NOR did I think "Oh my God, that poor thing" I blame my own life-experiences for never seeing anyone like her - not even on TV.
On the topic here though - I doubt Aliens would make it soooo obvious to try and blend in with average looking people, with aliens who looked like her - at least at Houston Hobby Airport!!! Maybe is some secluded village on a remote mountain top with a population of 28 - but unlikely here!