Some interesting discussion happening here.

Just one thing I noticed is that people keep focusing on merger protection with scope. That is important but we don't have to merge with frontier (or Ryan air or easyjet or any airline for that matter) to codeshare with them. We have zero codeshare protection except for a frozen seniority list with no furloughs. Ask a JetBlue pilot how code sharing is working out for them. Ask them how many of their passengers connect to a widebody on some other airline. Ask a delta pilot about their air France joint venture. Ask a southwest pilot the number one reason they voted no.