"Pax (passenger) in (seat) 13A is breastfeeding a cat and will not put cat back in its carrier when FA (flight attendant) requested," reads the ACARS memo.
The pilot requested Delta's Redcoat ground team meet the customer after landing to reprimand her.
According to an online source, the carrier was contacted for comment to confirm whether the incident took place.
Delta has tightened regulations regarding emotional support animals over the last few years after experiencing an 84 per cent increase in incidents.
However, unlike this case, it is usually the animal acting up.
Passengers are still allowed to bring their small dogs and cats in the cabin but they must stay in a kennel under the seat in front for the entire flight.
This does include an additional charge for customers.
The phrase 'emotionally supportive' has been interpreted broadly over the years, and in a statement, Delta said they had seen "comfort turkeys, gliding possums known as sugar gliders, snakes, spiders, and more," taken on planes.
One of the more famous fliers was Daniel the Emotional Support Duck, who accompanied a 37-year-old woman with PTSD on a flight in 2016.
