You heard wrong. There is not a flow though agreement with UPS.

If your goal is heavy freight, AMF isn’t going to give you any advantage. If you want to fly single pilot freight, go to AMF. AMF has an agreement with Omni but that company is an absolute dumpster fire to work for. You could get hired from AMF to Atlas, a few have done that but AMF isn’t giving you any advantage over a regional, probably less so in most cases.