Rocky,

As Pete said, the parking/emergency brake must be on and the transmission in neutral for fast idle to work. Depending on model and year, the parking brake also signals the brake lights.

I'm sitting on a plane or I would have already looked up the wiring diagram. BTW, I don't recommend spending the night at an airport. Sadly, there were no hotel rooms left. Travelling with our coach is so much better than what flying has become.