Originally Posted by Verdell

The wording of your post, and pardon me if I'm wrong, suggests that you might not fully understand how seniority works. Your OVERALL seniority doesn't care how long you've been in a base, a seat, or aircraft type. Only how many pilots were hired before/after you at Delta Air Lines. I.e. you don't "lose" seniority by waiting to changes bases or planes, and seniority isn't gained/lost any faster simply because you've sat in a particular seat/category longer. Your RELATIVE seniority is what dictates within your category (base/equipment/seat.) If you change category, you take your OVERALL seniority with you, and your RELATIVE seniority within that category (number of pilots in the same category OVERALL senior/junior to you) dictates your seniority in that category.