Originally Posted by
Kickthetires
I don't know performance wise but could the a220-300 work to replace them? I know it's unlikely that United will add another fleet but it's the only other option, other than what you named, that I could think of.
I don't have any personal experience with the A220-series so I did a search to compare capabilities.
It looks like the A220s have the range and short-field performance but at a lower seat count. I'm not sure how close that is because the data I found didn't get specific about the cabin configuration though it looks like they were listing high-density economy single-cabin for max capacity. With the different cabin widths, that might not translate proportionally to a F/E+/E configuration in each fleet.
The upcoming 737-7 MAX is projected to have a longer range and larger seating capacity. That may be what they're waiting for though I don't think they've ever specified any intentions.