I have a flight booked with CX in F from JFK - HKG that connect to SGN, but not until the next day (need to overnight in HKG). There is a United flight that I can book that leaves HKG about 2 hours after the CX flight arrives (there is no other CX flight to HKG that i could make). If I am arriving in CX F, could I use that boarding pass to gain access to the first class lounge? Or would I need to have a connecting CX flight that same day? Thanks