Allegiant Air seat selection policy may have changed since then. Typically, Allegiant Air operates on a fee-based seat selection system, allowing passengers to choose their seats during the booking process for an additional charge. The specific fees vary based on factors such as seat location and route. Passengers can opt for standard seats or pay extra for preferred seats with additional legroom. It is advisable to check Allegiant Air's official website or contact their customer service for the most up-to-date information on Allegiant Air seat selection policy, as policies can change over time.