I'm planning to fly from Boston to (ultimately) Bangkok in December. UA24 from Boston is scheduled to arrive at Heathrow at 9:35 AM, Terminal 2. My connecting flight would be Thai Airways TG911 departing Terminal 2 at 11:50 AM (so I should be at the gate by 11:20 AM, right?). If all goes exactly as scheduled, this is a 2+ hour connection time from one end of Terminal 2 to the other. But UA24, while usually on time, has arrived as late as 10:30 -11 AM. What are the odds that I'll have enough time to connect from UA24 to TG911? I expect to be traveling only with a carry-on, no checked bags. Thanks in advance!