The policy for extra legroom seats on airplanes can vary depending on the airline and the specific aircraft. However, there are some general considerations:

1. Availability: Extra legroom seats, also known as “premium” or “economy plus” seats, are typically limited in number and may come at an additional cost. The availability of these seats can depend on factors such as the aircraft configuration, booking class, and demand for the specific flight.
2. Seat Location: The specific location of extra legroom seats can vary depending on the aircraft type and airline. In some cases, these seats may be located in the bulkhead row (the row immediately behind a dividing wall) or in exit rows. These areas usually offer more legroom due to the absence of seats in front or the presence of emergency exit doors.
3. Additional Features: Extra legroom seats may come with additional features or benefits, such as increased seat recline, priority boarding, dedicated overhead bin space, or enhanced in-flight amenities. These can vary depending on the airline and the specific seat offering.
4. Seat Assignment: Airlines typically allow passengers to select or request extra legroom seats during the booking process or at check-in, subject to availability. If available, you may be able to choose your seat in advance, often for an additional fee. However, if the seats are not pre-selected or paid for, they may be assigned at the discretion of the airline during check-in or at the boarding gate.

It’s important to note that policies and fees for extra legroom seats can differ between airlines, aircraft types, and even fare classes. It is advisable to check the specific policies of the airline you are flying with to understand the availability, cost, and location of extra legroom seats for your particular flight. Additionally, seat availability can change, so it is recommended to select your seats as early as possible to secure your preferred choice.