T5 domestic arrival goes on bus to T3 security?
Could one not go up the escalator to T5 departures, and from there an airside bus?
What does happen if someone goes airside and then realises he's in the wrong terminal?
When arriving from domestic into T5, and connecting to T5 departure flight, one goes up the escalator to the T5 concourse. One does have to show the boarding pass to the guy to scan it before going up the escalator, which I assume will beep and not allow one past if wrong terminal.