Chris63 is absolutely correct.
My understanding is, that "by book" pax do not have access with separate ticket (and by that will be denied from FCT).
But as incoming F pax pax can use FCL (not FCT) as arrival lounge and that allows you to enter (but not give car to plane as pax can not be in transit).
What is actually quite fair from side of airline.
They do have in FCL-s and in FCT list of potential customer for that day. If you are not in that list, the entry may be difficult. And list is computed by bookings.