Nationwide, the glitch is causing widespread cancellations and delays.
The problem is with the system that collects airlines' flight plans.
FAA spokeswoman Kathleen Bergen says she doesn't know how many flights are being affected or when the problem will be resolved.
Locally, Sacramento International Airport spokeswoman Karen Doron says the problem has impacted at least one flight so far - Delta Flight 1652. It's a non-stop flight to Atlanta that normally departs at 11:39 AM. The flight has been cancelled.
Passengers are being asked to check the status of their flights online before going to airports.