Originally Posted by
tennessetom
Assuming you are able to get an online boarding pass you should be fine, I say assuming since you might not be able to check in on line for the second flight until your visa is checked, this one seems a little random in my experience, if you are unable to get the boarding pass you will have to go to the desk at t5 as normally you can’t get on the shuttle without a boarding pass, hopefully you have plenty of time to transfer
Arriving into T5 on an internationl flight you can get on the shuttle without a boarding pass
I sometimes do this and clear immigration at a different terminal.
the poster can take the shuttle to t3 then get a boarding pass/visa check at the ba counters in t3 transit area, if needed