The Air Travel Consumer Report May 2017 edition has been posted here.
The Report looks at data gathered between January and March on topics including consumer complaints, flight delays and cancellations and issues with baggage.
In this report American and United each received one civil rights complaint on the basis of race. There were two reports of pets dying in transit via United. American had the most consumer complaints at 183 and ExpressJet Airlines had the most complaints of mishandled baggage per 100 consumers.