Boeing and their speed schedules, should try Airbus, wayyy less draggy, bloody glider in fact
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The main prob with the 330 is that with a heavy aircraft, any tailwind, if you get high, the thing with the Trents won't slow down or go down easily. 340's are much better, more drag.
Regarding Wake Vortex sep, some of you guys should spend a day at Heathrow. Thats how to do it! They get very pissed off if you delay, rightly so.
EGGW