Is it safe to fly spirit airline?

Yes otherwise they would not be allowed an operating certificate or have it revoked by the FAA. However, on a recent flight from Las Vegas to Detroit 3/21/12 flight 488, many passengers had their seats reclined prior to take off. The flight attendants made no attempts to have passengers put their seats in an upright position. This is an unsafe practice and against FAA rules.

Also, if you are six feet tall or taller, you will have an uncomfortable flight . The seats are so close together that your knees are against the back seat of the person in front of you. If the person in front of you reclines their seat during flight, you may feel discomfort.