However, this also means that the wings are not optimized for the stretched Boeing 737-900. Among other things, this has the effect that the -900/ER has a lower optimal cruising altitude.

Usually, the Boeing 737-900ER needs a takeoff roll of about 2000 meters, or 6560 feet. That is the distance that the aircraft must travel to reach its lift-off speed and take off from the tarmac.

The impact was felt beyond just the Max, though because an earlier version of Boeing’s 737 — the 737-900 ER — also features this kind of door plug and required inspections.

Transforming an old Boeing 737 into a luxury residence was difficult, not just because of its placement on a cliffside but also due to the relative lack of space and awkward dimensions inside.