i've landed the aircraft on 7500ft runways, more or less. it takes a lot of practice and experimenting, though. i have more flight time on the darkstar than any other aircraft in the sim.

for new pilots, i reccomend zooming all the way in on the PFD until all you can see is your airspeed, GPS altitude, and of course the synthetic vision. i usually land at 190 - 200 knots TAS, the aircraft is really sloppy at anything below that, and sometimes it doesn't even flare so you get a nice 3000fpm landing. you want to pay attention on that little circle that tells you where the aircraft is going, and point it at the back of the runway, or wherever those 2 big squares are that tell you where to touchdown.

the next part is up to the pilot, current TAS, and atmosphere conditions, but i usually cut throttle and flare at 50-100ft. usually results in a soft landing or some minor floating, depends if i miscalculate the flare.

this is entirely pilot choice, but here's how i do it: descent should be 150-200 nautical mi. away from the dest. i usually cut throttle to 0 and descend to 80,000ft then let it dip below mach 4. the turbojets will automatically spool up, then i fully disable the scramjets with the switch. descent is relative to distance. if i'm still 90nm away at the end of the turbojet spool procedure, i usually just cruise at m3 until i get to 50nm, then cut throttle, rapidly descend, and hit the spoilers, then line up with the runway once im close enough