Originally Posted by Gone Flying

Short answer, no

long answer, You are hired with a 2 year seat lock starting day 1 of indoc, it can be broken for 3 reasons

1) you take your first upgrade at DL, in which case your new seat lock is added to your old seat lock.

2) DL opens a new category and you are awarded it when it opens, you will just have a new seat lock, the time from your old does not add to the new seat lock

3) after 1 year you are unable to hold your current aircraft in your desired base, you can change planes with the remainder of your new seat lock added to your new hire seat lock.

the company is free to let you break a seat lock if they wish (they don’t normally do this, but they can) also if you are displaced you can go wherever your seniority can hold and will not incur a seat lock.