American Airlines has rolled out the last of its "Heritage Plane" paint jobs that pay homage to the carriers in its merger family tree.

The latest two classic liveries are for TWA and AirCal, each of which was acquired by American and folded into the American brand. American acquired AirCal in 1987 and TWA in 2001. AirCal became the last of American's seven Heritage Planes to begin flying passengers when it went back into service on Sunday.

The move continues the tradition of US Airways -- which is now part of American -- to honor the predecessor airlines that joined the company through mergers or acquisitions.

American had already been flying five other "Heritage"paint schemes. One is in the colors of American's most-recent merger partner, US Airways. US Airways made its last-ever flight in October. A Reno Air plane also began flying for American in early November. American acquired Reno Air in 1999.

The three other "Heritage" liveries honor brands that helped shape the modern US Airways prior to its merger with American. Those aircraft include paint schemes in the colors of America West, Piedmont Airlines and Pacific Southwest (PSA).

The Reno Air livery became the first Heritage Plane to pay homage to one of American's predecessor carriers.