350 Miles on UHF

I just talked to Timothy Harper W5TAH on 446 MHz. He was in an airplane at 35,000 feet between Broken Bow and Texarkana. Typically this frequency its good for up to 10 miles depending upon terrain.  On VHF and UHF the height of your antenna.  He was using an HT but because he was in an airplane it was as if his antenna was 35,000 feet tall. Between his location and my house was 350 miles. My personal best record distance for UHF