BBAA meaning in General ?

The Blue Bird All American is a series of buses produced by American bus manufacturer Blue Bird Corporation (originally Blue Bird Body Company) since 1948. Originally developed as a yellow school bus (its most common configuration), versions of the All American have been designed for a wide variety of applications, ranging from the Blue Bird Wanderlodge luxury motorhome to buses for law enforcement use.

While not the first transit-style school bus, the All American is the longest-produced model line currently in production; it is currently in its sixth generation. Since 1952, Blue Bird has used a proprietary chassis for the All American, a practice later used for its TC/2000 and Vision buses (and their derivatives). The model line is produced with both front-engine and rear-engine configurations.

Alongside the current generation of the All American (released in 2014), the model line underwent major redesigns in 1952, 1957, 1989, 1999, and 2008. Over its 73 years of production, nearly all examples have been assembled by Blue Bird at its facility in Fort Valley, Georgia. From the 1960s to the 1980s, the model line was also produced in South America, using locally sourced chassis.