This is just one of the latest ones out of hundreds that have occurred at this airline. These events take place on a near-weekly basis. The odor is from neurotoxic vapors due to a cracked or ruptured engine wet seal. When these heated petroleum products come into the air supply of the passenger cabin this is the type of smell it gives off. These vapors are organophosphate poisoning which is very similar to Sarin gas which has highly detrimental health effects on the brain, heart, and lungs. The incident is known as what the industry calls a "Fume Event." This happens on the already defective bleed air designed aircraft which is only worsened and intensified when the engine wet seals are not replaced or maintained properly. That is why Spirit has more events than any other US airline due to their cost-cutting engine wet seal maintenance procedures in their ULCC Ultra-Low-Cost Carrier business model. They continue to intentionally operate an extremely unsafe airline which places the life of crew members and passengers constantly at high risk for injury. The FAA and NTSB has been contact hundreds of times regarding these ongoing events which are basically ignored or disregarded with no real investigative oversight or repercussions.

Aviation Travel Writer: The Flight Times Blog FUME EVENT: "Aviation's Biggest Lie" https://aviationtravelwriter.wordpress.com https://www.amazon.com/FUME-EVENT-Aviations-Biggest-Lie/dp/1365297977 https://www.facebook.com/groups/160176507895910