Paris, Zurich and Frankfurt airports said they had suffered problems with computer systems, but they had been quickly resolved.
Frankfurt airport confirmed in a tweet that Lufthansa and its partner airlines could not check in luggage during a 20 minute period.
Southwest Airlines said it experienced computer troubles at several U.S. airports, while British Airways confirmed that its online check in system had gone down.
Australian carrier Qantas reported that it had suffered an outage of its passenger booking system.
"Amadeus -- a check in system for passengers -- went down and now has come back up. Check in was resumed quite quickly," said Qantas spokesman Stephen Moynihan.
Amadeus operates software that underpins booking systems and other operations for airlines. It confirmed Thursday that it had suffered a "network issue."
"We experienced a network issue that caused disruption to some of our systems," it said in a statement. "As a result of the incident, customers experienced disruption to certain services."
Amadeus said that all systems were working normally by 9:30 am ET.
CNN has confirmed that the following airlines and airports were affected:
- Air France
- China Air
- Korean Air
- British Airways
- Incheon, Seoul
- Haneda, Tokyo
- Charles de Gaulle, Paris
- Gatwick, London
- Heathrow, London