Colour coding the ticket is not trivial - current monochrome printing is easy with thermals. Ever run a colour printer in an office? It's a nightmare to manage just in an of itself. Then there's a lot of investement in creating a system that works across all models of planes. It's doable, but it's not trivial.
Then on top of that is the issue that despite all this, a lot of people ignore what's on the tickets anyway and board when they feel like - the boarding crew are not going to tell someone to go back against the surging crowd and wait their turn. I've been on four international flights before and I followed the "people in this block, board now" - and when I entered, pretty much every time I passed by an uncalled block, it was at least a quarter full. People aren't disinterested particles.
Given also that planes are sitting around doing things both before and frequently after passengers have boarded (or waiting for the late passenger...), I don't think a straight-out claim that 10 minutes shaved off boarding times is a direct 10 minutes shaved off turnaround times (not that the article claims this, just being wary of it)
The video shows an "aisle management" technique, but it isn't a "boarding" technique, as the latter task is much more than wandering down the aisle.
You don't have to print the colors, you can have pre-printed tickets in two colors and have two printers at the checkin counter (likely much cheaper in ink, too, and much better-looking).
The airlines I've flown with actually do enforce it. At least for the first and business, and small children. If your group isn't called they'll ask you to stand aside so that group can go. Some people really push it and the crew would rather not get in a confrontation and let them pass.
Then on top of that is the issue that despite all this, a lot of people ignore what's on the tickets anyway and board when they feel like - the boarding crew are not going to tell someone to go back against the surging crowd and wait their turn. I've been on four international flights before and I followed the "people in this block, board now" - and when I entered, pretty much every time I passed by an uncalled block, it was at least a quarter full. People aren't disinterested particles.
Given also that planes are sitting around doing things both before and frequently after passengers have boarded (or waiting for the late passenger...), I don't think a straight-out claim that 10 minutes shaved off boarding times is a direct 10 minutes shaved off turnaround times (not that the article claims this, just being wary of it)
The video shows an "aisle management" technique, but it isn't a "boarding" technique, as the latter task is much more than wandering down the aisle.