The model of AMGH is a holding company. Unlike AMC which operates under a single certificate. AMGH purchases companies as an investment. Provides working capital to work to increase value and revenue. They allow the companies to continue to operate their own certificates. This means that each company is different in a lot of ways. Think culture and business models. Benifits and IT and a lot of HR is standard between companies though.
In limited cases they will merge a company into another. That is what happened with Egale Med. That was due to the atrocious safety record they had and AMGH felt it best to dissolve the company.
Now REACH has developed a holding company of their own. Which is interesting. This is a little more unpredicatable. Some purchases that REACH Homdings takes continue to operate as their own certificate while they meege others into REACH.
AMGH is most closely affiliated with Med-Trans, not AEL.