Hi FDF,
It certainly is! He has been busy on here again as well. He poses a sarcastic question and includes a stipulation telling me what length my response is allowed to be. No thanks.
On the PIA question, ticket availability is indeed one way. The US requires a stop between Pakistan and the USA westbound to satisfy security requirements. However, eastbound the aircraft is permitted to fly USA-Pakistan non-stop, which I presume it does. Therefore, whilst fifth freedom does apply to the MAN-JFK route, PIA only has seats to sell in one direction.