Wysiwyg, indeed LAX’s 4 runways are massive, well, 3 of the 4 at least. 25R and 24L are typically used for takeoffs, and they always go to the West over the Pacific, so there are no obstacles to clear. I, myself, have never seen or experienced takeoffs to the east at LAX. The longest flight out of LAX currently is QF’s LAX-MEL flight which is 7,900+ statute miles. SIN is too far to operate a non-stop flight (The A340-500 will supposedly alleviate this problem). SIA has stops in NRT and TPE on their 2 flights to LAX. UA has stops in NRT and HKG. Either way, those 7,000+ mile flights I’m sure are fully fueled, and if they only require 75% full thrust, then so be it. They do have a lot of runway to work with. Lastly, Kabir, when I flew Singapore from SYD-SIN, it was only a 7 hour flight, which means they probably only require about half the fuel needed for a 13 hour flight to LHR, per se. They still used up quite a bit of runway. Maybe it’s airline procedure to do so.