Originally Posted by
jetlink
-900ER vs -900 difference:
Increased MTOW to from 174K to 188K
Engine rated at 28,400lbs vs 27,300lbs
Increased range (hence ER Extended Range) from 2,700NM to 3,200NM
Longer and stronger wingspan by about 4.5 feet to accommodate for new MTOW
Cruse Speed M0.791 vs M0.785
Improved leading and trailing edge flap systems
I've also read that the rear pressure bulkhead is actually flat as opposed to the traditionally curved pressure bulkhead which allows for more space in the cabin.