My wife and I can drive half-way across the country in the same amount of time we can fly
Hogwash, for all but very specific itineraries (i.e. small place A served only by carrier X to small place B served by only carrier Y).
Let's take a VERY conservative example, tilting all the assumptions in favor of driving.
Take New York to Chicago, for example (which, at about 750 miles, is only about 1/3 of the way across the country).
Leave home at 7:30AM three hours before your flight, ample time to get to the airport two hours before your flight (that's an hour more than you need).
Take a 10:30AM flight from Laguardia, arrives O'Hare at noon.
You'll be in downtown Chicago by 1:30PM, even if you're slow through the airport, and you take public transport downtown.
That's seven hours, door to door, with a LOT of cushion. When I do the trip, it's about five hours, door to door.
If you're driving that same route, it's 794 miles, or 12 hours (without traffic or breaks) - more likely 13 or 14.
So, for this trip, which is a lot less than "halfway across the country," driving takes essentially 2x as long as flying.