Originally Posted by
luv_flying
Just tried the other way round by using T2 BP to T4 on Sunday. Was denied at the T2 transfer gate.
Well I think MainlyMiles did mentioned this in his blog:
https://mainlymiles.com/2017/11/06/s...gi-terminal-4/
Access (or lack thereof)
NOTE: There is no easy way to try out the transit area this terminal, without booking a ticket for a flight departing directly from it. Even though there is an ‘airside’ courtesy bus linking Terminal 2 and Terminal 4, passengers without a T4 boarding card will not be allowed to visit the transit area of T4 while waiting for their flight – in the same way that they currently can between T1/2/3 which have linked transit areas.
Basically T1 T2 T3 BP cannot access to T4
While T4 BP can access to T1 T2 T3 (If you check-in super early

)
If anyone here got denied accessing to T1 T2 T3 with a T4 BP using the route that MainlyMiles and I explained
here, do let us know.
I won't hesitate not to fly with Cathay Pacific - will be flying with Singapore Airlines to Hong Kong in the future if this happens.