<Ul> <Li> Maintenance problems with the aircraft </Li> <Li> Fueling </Li> <Li> Inclement weather, such as thunderstorm, hurricane, or blizzard </Li> <Li> Airline glitches . The top cause of flight delays, according to a USA TODAY analysis . </Li> <Li> Congestion in air traffic </Li> <Li> Late arrival of the aircraft to be used for the flight from a previous flight </Li> <Li> Security issues </Li> <Li> Earthquake, Tsunami in the event of 2004 Indian Ocean earthquake and tsunami, 2010 Chile earthquake and a 2011 Tōhoku earthquake and tsunami </Li> <Li> Terrorist Attack like suicide bombing in the event of Domodedovo International Airport bombing, 2016 Brussels bombings and a 2016 Atatürk Airport attack </Li> </Ul> <Li> Maintenance problems with the aircraft </Li> <Li> Inclement weather, such as thunderstorm, hurricane, or blizzard </Li> <Li> Airline glitches . The top cause of flight delays, according to a USA TODAY analysis . </Li>

When do airlines have to pay for delays