Yes, Horizon Air allows passengers to select their seats in advance. This service typically applies to flights booked directly through the airline's website or app. When you book your ticket, you may see the option to choose your seat during the booking process. If you do not select a seat at that time, you can often manage your booking later to choose a seat. There may be specific policies or fees associated with seat selection, especially for certain fare classes. It is advisable to check the airline's current website for detailed information regarding seat selection procedures and any applicable fees. This will ensure that you have the most accurate and up-to-date information about the seating options available for your flight.