The 12 mo bonus isn’t fully earned until after 24 mos of active service. So you’d be on the hook to pay it back if you went elsewhere during the furlough. Same with the big amount that could be paid after IOE ... it doesn’t start to be earned (vested) until after 12 mos.

The quarterly FO bonus for lack of upgrade after 24 months is vested as it pays, if I recall correctly. And the initial 5k signing is earned at completion of IOE.