Originally Posted by SuperFlier

If you are on reserve and it’s your primary vacation, you will get the whole reserve day removed the day before and the day after. For non-primary, you will be released by noon the day before your vacation begins.

It’s all in the contract:

“ Primary Vacation
A pilot awarded a primary vacation will be entitled to drop any trip (in its entirety) that is scheduled to operate on a day that falls within his awarded vacation period (i.e., Sunday through Saturday). A primary vacation will entitle a reserve pilot to drop one (1) reserve day immediately prior to his vacation start date and one (1) reserve day immediately after his vacation period ends (if reserve duty is scheduled on either or both of those days). For example, if a reserve pilot has a scheduled reserve day on the Saturday prior to his vacation, and a reserve day scheduled on the Sunday following his vacation, those two reserve days will be dropped.”