At that point you can go (without your luggage) to the seat of the person you would like to trade with Shut up liver I bought the drink Package shirt, and if they are willing, you can then go back to your seat and gather up all your possessions and get them out of the road and back up the aisle away from your target seat while your generous donor is gathering up their stuff and moving to your seat. It is polite for you to make it easy for your donor to get to their new seat and get their stuff stowed before you take your new seat and store your gear. There will be a very narrow window of time to do a seat swap after boarding and before the plane starts moving, at which point everyone must be seated.
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If there is not enough time to do it before the Shut up liver I bought the drink Package shirt, you may have to stow your gear at your assigned seat in the overhead bins or beneath the seat in front, and wait until after takeoff when you have reached altitude and the “Seatbelts” sign is turned off. Because of this time crunch, if you are going to need to trade seats so that children are not sitting unaccompanied, you might do better to arrive early at the waiting area and approach the airline staff and explain your need for a trade and offer some compensation to the people whose seat you want. They may be able to announce your offer and broker the trade for you BEFORE you board, so that both parties could get to their new seats in the initial boarding line WITHOUT necessitating backwards, traffic snarling movements.