3M, according to what I have been able to find, is courting a codeshare with AA. However if that doesnt work it appears they have a backup plan, its confusing and I'll spare the boring details, as you can look it up, but they seem confident that it will work. Only Time will tell. My gut at this point tells me, you will see 1900's flying under Americans colors in St. Louis soon. However, I have been wrong before many times.