The DPNA (Disabled Passenger with Intellectual or Developmental Disability Needing Assistance) code was introduced by The International Air Transport Association over a decade ago.
It is designed to assist people with intellectual and developmental disabilities when traveling. Emirati personality Khalid Al Ameri has a son on the autism spectrum. He created a video documenting a family trip from Abu Dhabi to Bahrain which he booked using the DPNA code on an Etihad flight spreading awareness on it https://www.thenational.ae/lifestyle/travel/triple-fold-increase-in-uae-travellers-booking-trips-using-little-known-dpna-code-1.966737.