Originally Posted by
goalie
125 should be a mainline flight number with that, you eliminate the need to transfer over to T1 so you should be fine in talking the airside walkway over to T3 as that takes maybe 10 minutes with a lot of luggage (and less time without)
I don't think it makes a big difference either way, as the OP is going to have to clear security after immigration either way. The pre-security walk to T1 is almost the same distance as it is to T3.
Either way, this is a completely reasonable connection.