I don't think we will see UA on sale until September when the route finishes.
They will be having a meeting with airport, airline and 1 north east and work out the profit (if any) has been made and what the plan for going forward is.
Hopefully they can use the development fund to help it come back next year.
I remember a statement months ago saying they were happy with the forward sales and the bookings made to date. Hopefully this is the case and the expected loading for year 1 are around 60-65%. At the time most flights were lucky to be above 20%
Remember the UK has seen extra flights to EDI, BHX AND MAN from the USA this summer. Some of the Manchester routes are barely hitting 70%!!
It's going to be a waiting game but hopefully it will be back even if it's just starts mid June..
Also they may be happy with loads of around 60% if they haven't had to discount the fares down. Remember the fares have been kept high so maybe United said if they drop the price the loads have to hit a higher figure so the airport and United agreed to keep the price high?