[RayChuang88]

I think Boeing has succeeded in building a plane that meets the world's strictest noise emission rule, the Quota Count 2 standard used by the British Aviation Authority at British airports, without compromising engine performance or fuel efficiency. As such, this means the 777-300ER with the new nacelles could operated out of London's Heathrow and Gatwick airports literally 24 hours a day with no restrictions.

[Regulator]

As such, this means the 777-300ER with the new nacelles could operated out of London's Heathrow and Gatwick airports literally 24 hours a day with no restrictions

A good point. That would be an outstanding competitive advantage for them - the other guy's airplanes are prohibited from taking off while your airplanes are departing every thirty minutes!