Seat selection means that the person can pre-select their seats with a fee for that. It basically means you can select your seat before checking-in in at an airport. You can either pick your seats directly in the app or with the airline, depending on the booking. If seat selection isn't available in the app for your booking, you can usually choose your seats directly from the airline.
Most airlines that charge a fee for seat selection do so only when you plan to do so prior to check-in. If you wait until you arrive at the airport, there is usually no charge. If you're willing to take gambles on getting the seat of your choice at the airport or by online check-in. If you have a free option, I suggest that you arrive at the airport as early as possible. When booking a flight with friends or family, it's normal to want to sit together, but is it really worth the money to pay for seat selection, or should you just take the chance and cross your fingers for good news when you check-in? While it is common for airlines, especially low-cost carriers, to charge for seat selection, research indicates that the vast majority of airlines seat parties together. According to Which, 86% of passengers who charged for individual seats would have been seated together regardless. The consumer group concluded that travelers are wasting large amounts of money because they are desperate to avoid being seated next to strangers instead of their friends, spouses, or children, based on data from the UK's ten most popular airlines. You've selected your flights, entered your travel details, and now you're being asked if you want to pay to choose your seats. When faced with the option of dramatically raising your fare or sitting alone for hours, it's difficult to know if it's worth it to pay a little more to sit together. The reality is that many of us stress when we don't have to.
DON’T BE TRICKED INTO PAYING FOR SEAT SELECTION: When going through the booking process, it can be frustrating, and you might not know an extra seat fee was added before you get to the final payment page. Even if an airline's website suggests that you must pay extra for a seat, you are never obligated to pick a particular seat and can still refuse seat selection in favor of a free seat assignment during check-in.
DO CHECK THE ADD ON WHICH APPEAR AUTOMATICALLY: Ultra-low-cost carriers like Allegiant, Frontier, and Spirit have been the most vocal in their attempts to impose seat selection fees. These airlines do not provide seat selection with all of their fares, but you can purchase packages that include seat assignments. Some legacy airlines have simply removed seat selection from Basic Economy fares, requiring you to buy a regular or Main Cabin Economy ticket to pick a seat ahead of time.