Unfortunately, my experience with Frontier over last several months(as an Ascent member since 2009(Summit in 2008)), is very poor with respect to them posting miles. I recently flew from Portland to Denver on Wednesday, August 18, and miles have still not posted. That's a full week counting today. It forces me to now watch every time, otherwise a flight my get lost/forgotten/dropped.

Action required by me every time to insure posting. Not my idea of a good program.