Aisle

noun

1. A wing of a building, notably in a church separated from the nave proper by piers.
2. A clear path through rows of seating.
3. A clear corridor in a supermarket with shelves on both sides containing goods for sale.
4. Any path through an otherwise obstructed space.
5. Seat in public transport, such as a plane, train or bus, that's beside the aisle.

   "Do you want to seat window or aisle?"