Again I ask, what does Frontier offer that United or anyone else NEEDS?

United has 700 aircraft deliveries between now and 2032. It doesn't need the aircraft or the orders.

United has 16.5 thousand pilots with plans to hire many more, but a gain of 2000 or so pilots via a merger isn't really worth that. The United-Continental merger is still within memory at United, and that was an ugly process. The company culture has mostly healed from that time, so why would United pursue an expensive merger with a messy SLI that will make everyone unhappy for 2-4 years minimum? All that for a mere 2000 pilots? I don't buy it. Not to mention the many senior captains at Frontier who strongly dislike United and who may decide to retire early. Or the base closures that would follow such a merger, upending life for the vast majority of pilots who don't live in Denver, Vegas, or Orlando. So your 2000 is slowly whittled away by these externalities.

Competitors' regionals, ACMIs, 135, foreign carriers, Southwest, Spirit, Allegiant, Frontier etc. all provide a healthy pipeline of pilots for United, without an expensive and legally arduous merger process.

As much as you hope, no one is coming to save you from F9 management.