That Spirit Airlines does not down the spirits of Delta Airlines by flying off with its passengers, Delta is reintroducing basic economy fares on its flights but it as some conditions attached. Booking these lowest air fare tickets will deprive the passengers from having seat upgrades. They would also not be able to make the same day flight changes and so far as the boarding is concerned, they would be standing last in the queue. The fares are expected to be lower than even the standard coach seat.
It is noteworthy that Spirit is currently perceived as a 55-seater airline which is expected to become a 100-seater in a few months down the line. So, it wants to get positioned quickly in the price-sensitive market so that it does not become a headache later on.