Just schedule the passengers to load in three waves, back to front, window seats first, center and then aisle.
Also drop the baggage fee ripoff. In fact award customers bonus frequent flyer miles if they check their bags. Also on fair weather days allow dual boarding—thats is passengers who are seated in the back of the plane have an option to use the portable stairs to board thru the rear door on the larger aircraft.
Southwest Airlines has the most efficient boarding process by far, and it is aligned well with a basic, tiered pricing structure.
I just flew to/from the Caribbean on business on American. They have so many boarding tiers, before the proletariat class is allowed to board. Some aisle seats were filled, before the window people boarded, further jamming up the aisles. I could go on an on, but anyone who has flown knows the experience of inefficiency of boarding. It is like the Greyhound bus culture has sprouted wings.
There is a spoof movie boarding scene with Joe Pesci. He is involved in crime where he has 3 decapitated heads in his carry on. It is quite funny - how he treats the young guy sitting next to him, and then when the flight attendant wants to move his bag.
I asked them that at several location- why do they always board people by rows 1 to 10, then 10 to 20, then 20 to 30, etc...
Because the second wave to board is always held up because the first wave is still seating itself.
Start from the back
Perfect solution. The time saved would be monumental. Passengers would be very happy with this.