If DL tossed this my way I would shift more business back. This year:
DL: 100K miles BIS (have hit DM due to rollover and AMEX MQMs)
$13K MQD and counting
$110K DL Reserve AMEX spend
AA: 98K miles BIS
$15K airfare spend with about $20K more coming this year (two large TATLs up front)
$30K Citi Card spend
My issue is that I cannot count on DL for tight connections. Knowing that someone actually "has my back" would go a long way to limiting my use of AA...particularly since I am within striking distance of MM on DL.