For priority boarding on American Airlines and thinking what group boards first on American Airlines and how you can avail priority boarding, one can get AAdvantage elite tier status by purchasing any of the 4 tiers as Gold, Platinum, Platinum Pro, or Executive Platinum to get a priority boarding with Group 2, 3, or 4. To avail of more details on purchasing of American Airlines priority boarding, one can visit the blog on American Airlines Boarding Groups from the aforementioned link by Airlines Group Travel.