A sales rep/employee lives in one state but flies/travels to different states in the course of his job. His W-2 is with the state he lives in and withholding is entirely in that state.
Does he have to file a tax return in every state he travels to in his job as a sales rep?
I suppose the same question would arise with an executive/employee who flies to different states in the course of his job. Should that person be filing with every state he/she flies to?