Originally Posted by
Infrequent%Flyer
Less trouble meeting minimum spend since KLM/Air France would count as well.
...when ticketed on DL stock.
Given that USAir will soon be divorcing from UA - if they haven't already - easier BOS-DCA flights (a couple of times a year, but not for mileage!)
Delta does not fly nonstop BOS-DCA. You can however do BOS-LGA-DCA.