Spirit, Frontier, or Allegiant?

[zeus]

I have not flown any of the three, but what I would look at more so that just the price is the number of flights per day from Phoenix to Vegas. One airline may have flights every hour and a half, where another may only have two flights per day. In case the flight you are booked on is canceled there are more options of you getting there on the carrier that has more options per day.

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