If it were a shirt with Bill and Hillary with similar text, would you be mad she was thrown off?
It's not the politics of the message, it's that word. That word alone should be enough to have her thrown off the plane. If you can't conduct yourself civilly, you can expect to be asked to leave a lot of places. Actions have consequences.
(If what I just wrote makes you sad or angry,
No they don't and how dare you suggest they do ! All actions are predetermined and intractble. They are solely caused by the suffering, humiliation and racist beliefs of othrr people.
This woman obviously had such a hard life wrought with such challenges and obstacles she had to overcome that she had no choice but to wear that shirt! How dare anyone suggest differently!
I condemn you on the altar of Political Correctness!