Planes are not necessarily full on Christmas Day, but they are jammed packed on Christmas Eve. I seriously doubt this man took an airplane to a city unfamiliar to him and then worried about trying to get to the house undetected without leaving a trail.
IF it's Karr, he more than likely drove, so he could find a discreet parking place near the house after he located the house.
Furthermore, if kidnapping was on his mind, he'd need his own transportation.
Wouldn't Karr's family have missed him, on Christmas night?
Why would he have flown to Colorado, where he didn't know anyone, gone to the house of a family he did NOT know at all, to molest a little girl, whom he didn't know lived there, at that time?
And guess what? Lots of people DO fly fly on Christmas day; they are NOT empty on Christmas day.
How long does it take to drive from Georgia to Colorado? I'm guess that it would take two full, very long days of driving, with a stop at night, to get some sleep.