I flew ZipAir earlier this year and I liked how they handled boarding.
Their "full flat" (the Business section) boards at any time because the seats are to the left as you enter the plane, but the rest of the cabin begins boarding from the rear rows first in groups of something like ten or twenty rows at a time.
That’s normal for most airlines that have a business / first class 3 E.g. full service airlines . The USA legacy ones are forgoing it to save jetbridge cost.
Their "full flat" (the Business section) boards at any time because the seats are to the left as you enter the plane, but the rest of the cabin begins boarding from the rear rows first in groups of something like ten or twenty rows at a time.