All I can say, if you want to churn some miles for FF, get both cards and crank up the first time bonuses. They will combine at some point and you may need them...Biggest issue I see is meshing the pilot unions.In the meantime, keeping them apart until the dust settles. Fists flew in a previous merger...Don't worry about DL--they'll probably buy someone else or sell their refinery products to everyone else, sit back and grin while AAUS battle it out in the corporate and employee and union trenches. This is gonna take some time.