Boeing does not make engines and the carrier is responsible for maintenance.
Max takeoff weight is typically higher that max landing weight for most aircraft.
BTW, I've been through a couple of engine failures (both single engine.)
One was my instructor's C210, the other was a friend's Bonanza. In both cases, the mlf occurred below 1000 ft agl, and in both cases, we got the engine re-started ~ 100 ft agl.
I learned much about emergency re-starts (and thereafter carefully rehearsed my re-start actions before every flight of which I was PIC.)
Always pack extra underwear.................