Originally Posted by
Stripe
While legal, it would be very imprudent to book that tight of a connection in DFW. There are plenty of nonstops to PHL that leave after the 10:21 flight. Try using the multi-city option in matrix.itasoftware.com. I picked a random date and got this. You then call up the Book with Matrix site, copy this page into it, select "Book with American" and aa.com will pop up with your desired flights there ready to add the passenger's name.

Would something like a DFW routing code and a MINCONNECT 3:00 extension code not assist in this search? Although I assume it would do it for both connections.