Originally Posted by Cujo665

To clarify that; you are covered by the CBA the same as any other pilot with one exception, which I'll get to. What this means is the company may not treat you any differently than any other line pilot. The same work rules, working conditions, benefits, and rates of pay apply to you as to any non-probation line pilot.

Here's the differences.
If they violate the contract on one of the CBA sections or issues, the union will still take your grievance and fight to defend the contract language, not you specifically, but the CBA. The end result is you get the benefit of them defending the CBA.
If you violate a company rule, regulation, policy or otherwise get into trouble for something that does not violate a CBA section the union is not obligated to defend you. That does not mean they can't, but it would be exceptionally rare.

So, the short version is, they'll defend the CBA even if it means a probationary pilot is getting that benefit; but they won't defend you specifically.
Clear as mud ?