5 Outsourcing by Airlines. Airlines have increasingly outsourced the maintenance of their planes to other companies. A concern voiced by critics is that the mainte- nance may be less carefully done so that outsourcing creates a safety hazard. In addi- tion, flight delays are often due to maintenance problems, so one might look at government data on percent of major maintenance outsourced and percent of flight delays blamed on the airline to determine if these concerns are justified. This was done, and data from 2005 and 2006 appeared to justify the concerns of the critics. Do more recent data still support the concerns of the critics? Here are data from 2014: AIRLINE Outsource Delay Outsource Delay Airline Percent Percent Airline Percent Percent Alaska 51.0 10.35 JetBlue 68.4 19.93 American 29.4 20.32 Southwest 58.2 28.47 Delta 36.7 14.48 United 52.6 23.46 Frontier 46.3 21.42 US Airways 54.3 13.68 Hawaiian 78.4 5.06