Originally Posted by
threeoh
I don't have any personal experience with this scenario but I gather that if you select E+ at while Gold, and then fly when not Gold, you won't necessarily lose your seats unless something weird happens like an equipment swap. You aren't entitled to them but you will generally speaking get to keep them.
That was my experience a year ago when I dropped from Gold to Silver. Booked flights at the end of Jan for Apr and May and my E+ seat stuck for all flights as there was no swap.