IF you do what is on paper as their job by signed contract, then you won't win a popularity contest.
is a closed shop, then were you hired as a scab to take the place of someone there? That is the key and you had better find out. Is it NAY mainline and will you be working the same flights on the same ramp as NW IM
is this job contingent on a labor problem like a strike? What were the conditions of your hire? I do not know if short term summer help has been given the OK
to not be union members. Possibly. Just remember that it's pretty stressful right now and no-one knows what's coming.
You have to remember that you will have an airline full of people that are trying to protect their livelihood from being taken away from them. Arguments on the economic righteousness of that are unimportant now in your question. What you have to decide is what exactly were you hired for and if that is what you want. These are unsettling times indeed.
I do hope that all works out and you have an enjoyable experience. Please advise if this was a specific job offer or an open application from you? That would make all the difference. What city is involved if specified and is this a full time or part-time position. Why, I believe their are many laid off employees that would legally have first right on openings but some won't move for a part time position. We have to little information but we need the help during the summer. The work is defined and expected and individual attitudes unfortunately can't be controlled.