Thomas Borchert wrote:

Bush, as bad as he is, would create major havoc with the U.S. air
carriers if he shut down the system.



The air carriers are not really major users of GPS, AFAIK.


Not so. Although the US air carrier fleet has less than 50% GPS
equippage, virutally all international flights are with GPS-equipped
aircraft.

And, some carriers, like ALaska, have GPS and the other goodies for
advanced RNP, performance-based instrument approach procedures. By
year's end KPSP will be added to the short list of new RNP SAAAR RNAV
IAPs (KDCA and KSUN already being published).

Starting next year the U.S. should see an additional 25 RNP SAAAR RNAV
IAPs each year.