Looking at Swissair's $307 rt fare, I am considering to do a little mileage run ZRH-LAX in January. I'd fly into LAX on a Saturday, stay a night at an airport hotel and leave again on Sunday.

After 9/11 and given that I am only 19 and thus maybe not fitting the "average mileage runner profile", I could imagine that I'll have problems with US immigration. ("You spend $400 [flight+hotel] on a weekend?")

Will there be serious problems? Any advice? Appreciate your help.