Starbucks is bitter and over priced, mickyD's and DD are ok if you are out and about, but not worth getting dressed and making a special trip for just a cup of joe.
When I used to fly, I would always buy Starbucks coffee in the airport because it was UNIFORMLY BAD & BITTER and the others were unpredictable, only BAD & BITTER sometimes. Now I am retired and make wonderful coffee for myself.