Originally Posted by
Microwave
There is no boarding pass check at Flight Connections T3 security, so it is perfectly possible to enter T3 without a BP for that terminal.
It might be possible to reach T3 airside from T2 Flight Connections without a boarding pass (I'm sure it is not intended to be possible) but your problems will then begin. How are you going to get out of T3 airside? The only way you can leave is on a flight, or ask to be escorted out through Immigration and Customs - and at that stage you will probably be asked how you got there. There's no way you'd be able to get to T3 Flight Connections to take you to T5 AFAIK.