its the alternate method to driving, that's all.
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.