The May, 2014 Airline Pet Travel Report contains pet incidents for the month of March, 2014.
On Alaska Airlines flight 5 from Washington, DC to Los Angeles, CA, a four year-old, male, Border Collie named Ninja escaped upon arrival in Los Angles. Alaska Airlines reports that during transit the dog chewed through the side of the kennel, then escaped once the cargo door was opened. The dog was found later that day in good condition. No corrective measures were taken as the incident was self-inflicted.
On American Airlines flight 1674 from Dallas, TX, to Miami, FL, a cat named Molly died during transit. American Airlines reports that the cat was found to be unresponsive at a connecting city, it was then taken to the vet where it was pronounced dead. The death occurred for an unknown reason, thus American Airlines took no corrective measures.
On United Airlines flight 0417 from Tampa, FL to Denver, CO, and 8 year-old, male, dog named Whiskey was found dead upon arrival in Denver, CO. United Airlines reports that postmortem the dog was taken to the vet which stated that the dog had previously had surgery and that a small piece of synthetic surgical gauze which appeared to have been left in the abdomen caused peritonitis.
On United Airlines flight 1221 from Honolulu, HI to Washington, DC a 5 year-old, male dog named Mason was found dead upon arrival in Los Angles, CA. United Airlines reports this pet was being shipped with another dog of the same family. Mason, however, was discovered deceased upon arrival. A necropsy report credited the mortality to gastric bloat syndrome.
Source: May 2014 Air Travel Consumer Report.