More than 11,300 US flights were delayed or canceled on Wednesday, according to FlightAware, in the first national grounding of domestic traffic.
Spain's Iberia Airlines, which also flies to Israel, is the most punctual in Europe this year per the report, while Delta Airlines is the most punctual in North America.
Many people get annoyed, get uncomfortable or are even scared of turbulence while flying, but many don't know what turbulence is.