A Bridge Too Far
From wiki
An idiom inspired by Operation Market Garden, meaning an act of overreaching

We all know the history. I think its an analogy to what our CEO has done in demanding a concessionary, cost-neutral deal during unheard of, record profits from his most valuable asset -- his pilots.
Trying to do a quick but cost-saving deal, He has ridden his horse "dalpa" too hard and too fast and she is coming up lame. Now he is going to risk his legacy and his 17.9 million shares as he walks alone through the desert alone. Labor is back on the table.