Originally Posted by
Globaliser
On long-haul, you can usually find out the gate number something like 90 minutes ahead, sometimes more. You may have to ask, but I've always found the information willingly given if it's available.
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I always ask at either the customer service desks in T5A or as soon as I get into the lounge, and (so far!) they've always had the gate number available well before it appears on the departure screens. Based on that I head to the most appropriate lounge...