Actually, if that number's written right, it's 18 1/2 BILLION.

mike regish

"Larry Dighera" wrote in message
...

What seems infinitely more significant is the awesome magnitude of
exhaust spewing from airliners as a result of burning 18,536,000,000
(that's 18-1/2 trillion) gallons of kerosene annually*; one would
expect some environmental impact.

* http://www.aopa.org/whatsnew/factcard.pdf