Tony Tyler made the comments to industry officials and airline CEOs at the annual meeting of the International Air Transport Association (IATA) in Doha, just three months after the disappearance of the Malaysian plane with 239 people aboard.
The IATA represents 240 airlines carrying 84 percent of all passengers and cargo worldwide.
"Discussions about real-time tracking and airline safety feature in many sessions of the IATA meeting, held this year in the Gulf-Arab nation of Qatar. That's because passengers and even experts continue to wonder how an aircraft can just disappear without anyone knowing what went wrong," Tyler said.
"I have no idea what happened to that aircraft. To be honest, I don't think anyone else has either," Tyler said.
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He added that until the aviation industry knows what happened and what caused the airplane to disappear, there is not much to do to prevent it from happening again.
Qatar has just unveiled a new, 15.5 billion USD airport in the capital, Doha. Qatar Airways CEO Akbar al-Baker said his airline is exploring technology for continuous aircraft tracking that could not be switched off by anyone onboard.
"We are in the 21st century and unfortunately we are still learning," al-Baker said.
The industry is looking at ways to continuously track aircraft in ways that do not require a constant stream of data, which may not be manageable for tens of thousands of planes each day.