Trolls and labor issues aside, there are a number of points here worthy of consideration.
1. The recent incident where the A/C landed in Boston involved the same aircraft which had been involved in the prior incident in South America, if I am reading correctly. If that is the case, the aircraft should be removed from service until it has been thoroughly inspected, possibly with the involvement of the FAA and OSHA to see what residues in the ventilation system may remain...the investigation should be made on a forensic level if this has not already been done-because if something does happen, and someone gets sick or dies (NOT saying the F/A who passed was or was not affected by such fumes), the company will most certainly be liable, as will whichever maintenance company performed the work on this aircraft.
2. In reading the stories of fumes incidents, it does appear the common denominator may in fact be the servicing shops. Records of ALL affected aircraft should be reviewed to see if a pattern exists (ie. service at the same facility for the same problem, etc.) in order to help isolate a root cause.
It would behoove BOTH management and labor to NOT use these occurrences for their own political/business advantage, as such a tactic will almost certainly backfire. You are talking about a phenomenon which is affecting the health and wellbeing of the EMPLOYEES and the CUSTOMERS of US Airways...no stone should be left unturned to get to the bottom of this.... This is serious folks, so cut the sniping, trolling and other BS and let's find out what is REALLY happening here. It's not about YOU...it's about EVERYONE. Regardless of whether or not this is a union slogan, SAFETY FIRST...no BS, just deal with keeping everyone SAFE.