from CNN's web site (whether its relevant to the current situation remains to be seen but interesting nevertheless):

"American Airlines uniforms and a pilot's key card -- which grants access to the holder to any American Airlines facility in the world -- were taken from a hotel in Rome, Italy, earlier this year, police said Thursday"

Questions:

1. Why do pilots carry around world-wide access cards?

and

2. When one goes missing, why can't it be locked out or the system reset? (Hotels do it for example)