Is this a good idea if I'm going to be leaving my car at the airport for a few days ? Just one safeguard of many from someone driving away w/ my car. Sure they miht break into it, but atleast it would deter them from stealing the whole thing.

 

I wouldn't count on that alone. If you have time, see if you can install a kill switch at least.

 

Ditto the above^^^^ but definitely better then nothing.