I have 3 booked on a F award DUB-LHR-ORD tomorrow at 1500 with the TATL leg at 1530 on the 26th. The short leg is booked in economy because biz space wasn't available to make the ticket work - at least 3 months ago.

Are there options to upgrade the short leg if space has now become available since I'm on a F award fare overall? Or alternatively could we take a later flight that evening to spend more time in Dublin? I've been able to secure a SDC to an earlier flight in the past when I was already at the airport but I've never tried for a later one.