Originally Posted by
cova
I had been on domestic flights with empty F seats (but not lately). Best time to find a flight with empty F seats is last flight on a Saturday night. You might also get one on an RJ that has 12 F seats at off peak times.
With most flights full, non-rev'ers know the flights that are not going to be full (in coach or F) so they choose these flights.
As a person who flies non-rev occasionally, the flights that have lots of empty F seats are the ones I try to get on(as you pointed out). But I have seen a couple off peak flights that went out with really light loads in F.