Terry has currently flown over 5.75 million commercial airline actual flight miles
5.16 million actual flight miles on United Airlines
More than 350,000 miles on Southwest Airlines
Flights on among others Pan American Airways, Trans World Airlines, QANTAS, Alaska, CAAC, Alitalia, British Midland (BMI) Lufthansa, Austrian, Cathay Pacific, Jet Airways and Aeroflot
5.75 million miles is:
230.08 times around the world at the equator
12.05 round trips to the moon, four more than the total number of Apollo missions, orbit-only and landing
16.07% of the distance to Mars at opposition, when the Earth and Mars are on the same side of the Sun and in a straight line
Assuming an average flight speed of 550 miles per hour, that is 435 days or 1.19 years sitting in an airline seat 24 hours a day
Terry is actually a net 0.120 seconds older than his chronological age due to the combined effects of Einstein's Theories of General and Special Relativity
Under Einstein's Theory of General Relativity, exposure to the lower gravitational field seven miles further from the center of the earth caused his relativistic clock to run 0.160 seconds fast (making him older)
Under Einstein's Theory of Special Relatively, traveling slightly closer to the speed of light at 550 miles per hour relative to the earth caused his relativistic clock to run 0.040 seconds slow (making him younger)