For some reason, United seems to be loading their seasonal schedules much closer to the seasonal starts. While Delta is already showing their ATL
service for next summer it wouldn't be surprising to see United not load the ORD
service until late winter if they decide to do it. Delta also loaded their 757 service from ATL
for next summer but again United hasn't added their ORD
. In fact United just loaded their BZN
for December a couple of weeks ago. Not sure what the benefit for United is in waiting other than to push people vacationing in Montana to other airlines and hope they get higher fares by waiting. Pretty difficult for passengers to plan vacations in advance if the service isn't loaded.