most of us with 22+ yrs seniority can't get up front--much less in coach seats these days!! The medallion members snarf them up like oxygen!
DL is not 'sposed to upgrade OAL zeds at all (except NW which will be moot issue after 23June)
I've recently had buddy pass rider change plans 3 times to get here and home over several days. good luck!
PS--first advice: avoid ATL and prob NY and CVG and SLC and...