Delta Air Lines is cracking down on support animals taken aboard flights.  

Beginning March 1st, passengers who wish to take their support animal aboard a Delta flight must show proof of health and required animal vaccinations 48 hours in advance.  

Delta said in a statement travelers with psychiatric support animals must have a document confirming their pet can behave. 

The airline says it's intended to keep untrained and sometimes aggressive animals from traveling without a kennel in the cabin.  

Customers have attempted to fly with some exotic animals, including comfort turkeys, possums, snakes, and spiders. 

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