Pros
There is a good core group of people within Frontier, people who care about their jobs. I can not vouch for the new subsidiaries such as Midwest and Republic.
Cons
This company seems to be trending downward, and rightfully so because this company was taken over by a regional airline who received its revenue by contract flying for major airlines. Now this company (Republic) has to take on running its own major airline, and once it figures out what it's doing, it will eventually trend upward. However, it is unknown how downward it will go before it figures out once it is doing. Frontier was always known as one of the highest satisfaction companies, but it hasn't been able to retain its position there because of constant company changes, primariily from its owners (Republic) who is still learning.