This back and forth is non-sense. Both feeder managers have directly expressed great concern over both companies futures if the feeders start to have worse issues than they have now, much less, failure.
If Mountain Air or Empire fail (both WAY smaller than Ameriflight), FedEx will have serious issues. If Martinair, Keylime, or Ameriflight fail, UPS will have serious problems. Non of them can pick up the slack of the other right now.
You may not like it or agree with it, but that is the situation in the freight world. The solution is an easy one regarding UPS and Ameriflight. I don't know who is resisting, but it doesn't seem like it's the pilots or their union. When talking to the pilots at least. "What's your hours? You fly those things by yourselves??? (Yes, even the 99 and 1900) You're a shoe-in here"