Correct. Non members will always be looked at askance by their colleagues...if such things matter to that individual. The ultimate issue (among others) is whether such non member will honor a picket line should things come to that. As a non member, the company may not agree that you can refuse to fly.
Where I am from non-union members should be allowed leave of absence during the time members are on strike. Without pay or right to any compensation from the union, but they can still assume this
neutral position. My experience is that non-unions members have carried on regardless, cashing in on overtime payment. Quite unfortunate...