Not sure how willing UA is to devote significant resources to CLE. So far, they seem to be maintaining the hub's status quo with a few minor tweaks. It would help if a 757-200 could consistently make the trip without having to stop for fuel westbound, but I think FRA-CLE is just out of range. Does UA have a spare 767-300 to use on this route (too bad UA is retiring the perfect sized 767-200ER). I hear anecdotally that UA trucks tons of cargo to EWR from CLE, so maybe cargo could help subsidize the flight. Perhaps they could come up with some revenue guarantees like PIT has done to get the flight going. But then eventually, the flight would have to make decent money for UA for them to continue it.

On a related note, where do the plans to redo the international arrivals area at CLE stand? I think the new Master Plan addresses this, but I'm not sure the demand or funds are there to do this right away.