Aerlingus flight bought using United miles - cash upgrade possible?
I bought an Aer Lingus flight in economy-saver with United miles (Seattle to Dublin direct oneway). Its is a 016 ticket number.
Has anyone who got this, were they able to pay cash to upgrade a united-mileage-bought aerlingus flight? I called Aer Lingus and they said to go talk to United (which obviously is the wrong answer since i want to pay cash to upgrade not united miles etc). AerLingus's bid-for-upgrade system exists but it seems to be for their own tickets, not 016 ones.
If someone has first-hand experience of upgrading a united-mileage bought aer lingus flight (e.g. they were able to upgrade at the airport) it would be great to get some datapoints (with approx cost for a trans-atlantic upgrade cost).