#10 You talk fluently using airport codes.
#9 You've flown more than some of the airline pilots.
#8 There're days you wake up and have no clue which city you're in.
#7 You meet your close friends mostly at random cities around the world.
#6 You follow airlines on twitter.
#5 You checkin for the next trip before your current trip is over.
#4 You've memorized your passport number.
#3 Your family meets you at the airport between your flights.
#2 You have "Up in the Air" moments: pilots greet you in the middle of flights.
#1 In any given month, you're touched more by the TSA than your better-half.