Originally Posted by
tasnam
I am not sure that is helpful....(not said snarky)
The ONLY option on UA.com is "Economy/Premium Economy" OR "Business/First" selection boxes. I cannot "deselect" premium economy.
Are you suggesting that IAH to IAD on ANY DAY would have zero Y, B, M fares?
I cannot use the fare buckets for ANY flights anywhere, any day.
I am very confused so I do appreciate the help...

I see Economy and Premium Economy (Premium Plus=OAR) as separate options on desktop (as you say, ua.com), but it's true they are the same on the mobile app. Either way, IAH-IAD usually doesn't use PE equipment as far as I know; these are usually available only only longhaul widebodies.