Thanks for the reassurance everyone! Just wondering:

When I booked my ticket (I purchased online), I don't recall them asking for any government ID# or anything to identify me, just a name and credit card. How do airlines know it's me that booked the ticket? I do remember when I was younger all they did was swipe my passport and they found my ticket (even though I didn't give them the passport # before). Also I remember in e-checkin swiping the credit card I used and then located my booking, but that makes more sense...