Per Aero Corner, planes boarding front-to-back allow for better balance. As engines sit at the back of the airplane, it’s important that the front is evened out weight-wise before passengers start to move to the back. Planes are an incredible invention, but they still need to be used correctly in order to fly smoothly, hence the balancing act.
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If you’re a nervous flyer, you don’t need to worry too much about balance. A plane tipping slightly one way or the other won’t cause major issues. It’s mainly annoying for cabin crew when they are trying to get everything arranged. Plus, it’s difficult to align the jetway up to the door so passengers can board when the plane balance is off-kilter. Luggage also needs to be taken into consideration. If passengers start from the front and put their luggage in an overhead space, the plane won’t be as unbalanced compared to if passengers did the same but started from the back.
