Hello and welcome,
The EEOC, in acting on its authority to investigate claims of discrimination under federal law and enforce federal anti-discrimination laws has determined that collective bargaining agreements do NOT pre-empt the ADA's requirement to accommodate disabled individuals, although some courts have found the opposite.
Therefore, it is an issue that is not settled until the U.S. Supreme Court rules in the matter, or congress clarifies this issue, neither of which is likely to occur soon.
Here are links that provide more information on this:
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