The best method has been the subject of study for years but now various approaches have been put to the test.
Boarding those in window seats first followed by middle and aisle seats results in a 40% gain in efficiency.
However, an approach called the Steffen method, alternating rows in the window-middle-aisle strategy, nearly doubles boarding speed.
I wonder if Steffen could have patented his boarding approach as a business method. It may be too late now. But if he had, he might have become a very rich fellow.