El bunto,
I agree with your argument, but why 2 hours at an airport? With on-line check-in and hand luggage only, I usually allow 40 mins from car parking to boarding. I cut it too fine once at 20 minutes (at LPL) and although I made the flight, it was a bit stressful. I think that 1 hour is more than ample at most airports if you are a regular traveller, perhaps a bit more if unfamiliar with the airport, but 2 hours is excessive.