At least one or two of the calls were quite urgent - We got the call late in the evening and were in the car within an hour or two.

Flying would've meant booking a last minute flight, waiting for whatever flight time, getting to the airport an hour or two in advance, landing at our destination, arranging transport, and then taking a two hour trip by ground transport. There was so much in the way of overhead and transition costs it didn't make sense. (Amtrak had the same problem.... we've tried that before too, but only once.)

Not possible for me since my car is full of computers usually.