DAL guy here, trying to understand your WB positions. You guys have a biddable "bunkie" position? From what I've seen on our 4-man crews is that the senior Captain is in charge and they generally look to see who needs the landings. The last 4 man trip I did, the lead Captain pointed at us two FOs and said you guys are about to expire so you will get the landings, what breaks do you want. Always interested to hear how other operations work. Thanks.