You really don't need a reference, it is pretty straight forward:

All AA U.S. domestic flights not operated by American Eagle or American Connection (if it still exists) will have First Class, this includes Hawaii flights.

All AA flights to Canada, Mexico and the Carribbean have the premium cabin branded as Business Class.

All AA flights to London Heathrow and Tokyo will have first class.

All AA flights from RDU to London Gatwick have First Class, as do most DFW-LGW flights. Some DFW-LGW are operated by 767-300s and only offer Business Class.

All AA flights to Paris, Rome, Madrid, Brussels, Zurich and Glasgow only offer Business Class.

AA's flight from DFW to Frankfurt offers First Class. The flight from Chicago only offers Business Class.

AA's flight from Chicago to Manchester will have Business Class. AA's flight from Boston to Manchester only offers Economy Class.

In South America, flights to/from Brazil and Buenos Aires are the most likely to have First Class, but not all do.