Originally Posted by
findark
United uses fares with 'I' in 7th position to convey an Economy Plus entitlement at booking and thereby market an "Economy Plus" fare.
Originally Posted by
xliioper
It's a bit confusing, but the applicable cabin is noted in the fare rules for the fare, not the routing rules which is what is being shown above --

Didn't even realize that UA sold fares which conferred E+ in the fare rules, as opposed to add-ons/buy-ups during the booking process or afterwards.
Does UA market these fares in this manner on the website?