Originally Posted by
jsloan
It makes me wonder what exactly the modifications are and whether or not it’s possible to add them during an upcoming retrofit. 5 tons can be a very meaningful difference at max range. I doubt UA wants to say “well, we can wait until tomorrow, or we can swap in a plane tonight, but we’ll have to leave 50 of you behind.”
I am not an engineer or plane tech guy, but I saw that thread on A.net and a poster was saying that the IGW improvements will become "standard" on all planes manufactured from that point moving forward, and that airlines can just choose them to be de-rated (much like what SQ did with their 777-200ERs). No retrofit possible.