There are 3 that I can think of:
Maybe its their accents and their uniforms, but it is probably just nice to see some attractive girls with meat on their bones.
American Airlines(Miami based):
This applies only to the Miami base. Girls in the Miami area are attractive...period. The F/As seem to blend a lot of Latin with a little bit of the USA. Very beautiful.
I used to see the crew that flew Los Angeles-Guangzhou flight at the gate across from my DL LAX
redeye gate. They had these perfect red uniforms that were more business like than Singapore's....and seemed more classy. Very beautiful Chinese girls!!!