Even though its closed I figured it was worth noting this info. Low Cost Carriers (LCCs) often thrive on the single fleet type.
Southwest, Ryanair, Spirit, Frontier, EasyJet, etc. they all have 2 things in common.
- Low(er) prices than what you’d find on the market from legacy carriers
- Single fleet type
The single fleet type is beneficial due to the fact that some folks already mentioned. The type rating. A single type rating that covers multiple sub-models of an aircraft allows the airline to utilize their pilots across multiple types of aircraft. There is a separate type of training that’s not very extensive. Generally a few days of additional training; called “Differences Training”. This training is what it sounds like, learn about the differences between the various models of aircraft of similar setup. (737-700, -800 / A320, A321)
It’s all about saving money. Look at the success of Southwest. Largest operator of 737’s yet still able to keep prices below that of legacy carriers. Saves the company from having to train pilots on multiple types of aircraft which in turn affects the customers by not having to pay as much for a seat.