dook has it. Billings Logan KBIL, 3652' ASL. Sitting on a 500' escarpment immediately north of downtown Billings.
The second US airport I ever landed at, on my first trip to Houston. Calgary-Great Falls-Billings-Denver on a Western 737-200 and then Denver-San Antonio-Houston on a Texas International DC-9-10. It was a long day! By way of contrast, my second landing there was last year in an RV-6A, on my way down to Douglas, Wyoming, to see the total solar eclipse.
jensdad, a new tower was built and became operational in 2006. I presume the old one was demolished.
dook has the con.