AAA, BBB, CC . Yes, it matters. AA can apply the “flat tire” (
https://www.flyertalk.com/forum/amer...er-thread.html) “rule to domestic “BBB” missed flight, but there’s not such a provision internationally, for example.
No, it was not at all obvious both flights would be AA. We get a lot of queries in this forum about AA-other airline and other airline-AA connections.
AA to AA generally the airline will seek to accommodate you on the next flight with available seating in cases of two PNRs and IROPS causing you to miss your second flight.
If you have important business at “CCC” some of us would say that should be a priority lest you not arrive in time and be dismissed as unreliable by a client.
