Home Business Boeing 737 MAX may not return to service until August: IATA head Business Boeing 737 MAX may not return to service until August: IATA head By Genpie - May 29, 2019 245 0 Facebook Twitter Google+ Pinterest WhatsApp Boeing Co’s 737 MAX is unlikely to return to service before August, the head of the International Air Transport Association (IATA) said on Wednesday, adding that the final say on the timing rested with regulators.