Flight turbulence incidents on the rise as global temperatures climb It's been a dramatic few days for commercial aviation with passengers on three airlines suffering terrifying ordeals involving severe inflight turbulence. Nadine Itani, Programme Leader and Lecturer in Air Transport Management at the University of Surrey tells FRANCE24's Tom Burges Watson that for every 1% increase in average temperature there's an estimated 10% increase in the frequency of clear-air turbulence.