I can just picture some engineer dashing up the mountain as fast as he can in his car to set up a Ramsey transmitter for a few hours and trying to “technically” get the station on the air according to the FCC.
In all actuality, they probably have a few days/weeks to submit a license to cover or request an extension. The FCC has gotten quite more laid-back these days...I’ve seen stations with a CP that has been expired for months get a license to cover.
It has to be on the air with the same parameters as in the construction permit and they have to certify this.