Websites for the three largest U.S. airlines were briefly down on Wednesday because of a technical issue with flight data software they use from Alphabet Inc's Google.

American Airlines Group Inc, Delta Air Lines Inc and United Airlines Holdings Inc all experienced downtime.

"For roughly 90 minutes today, a glitch in our flight shopping software prevented our airline partners from displaying fare information. We have now resolved the issue," Google spokesman Craig Ewer said in an email.

American said in a statement that the issue did not affect flight operations.

Outage monitoring website DownDetector showed a spike in reports of problems, mainly related to website issues, beginning around 1:30 p.m. ET, before tapering off.