Flights Are Moving Again, but the Ground Stop's Aftershock Cancels Thousands More on Saturday

America's airspace reopened Friday night, but the recovery is proving slower than the shutdown. Airlines canceled thousands more flights on Saturday as airplanes and crews remained stranded out of position after Friday's nationwide ground stop, and the combined toll for the two days has passed 12,500 canceled flights, ABC News reported, citing the flight-tracking service FlightAware.

The Washington Post reported that thousands of Saturday flights were canceled or delayed, according to flight trackers, and that officials have pinned the outage on aging air traffic control systems. Axios counted roughly 3,000 Saturday cancellations as the disruption stretched into a second day, and early-morning data it cited showed Atlanta's Hartsfield-Jackson, New York's John F. Kennedy International and Boston Logan as the hardest-hit airports.

A ground stop can be lifted in a moment, but its effects linger. When departures across an entire country are frozen for more than four hours, jets end up parked in the wrong cities and crews run short of the hours they are allowed to work, so airlines must rebuild their schedules one rotation at a time. An aeronautics professor told Fox News on Saturday that the disruptions could take days to subside. With Thanksgiving less than two weeks away, carriers have little slack to absorb the backlog.

Transportation Secretary Sean Duffy has blamed outdated routers that were overwhelmed with data, along with copper communication lines dating to the 1980s, Fox Business reported. He has asked Congress for $50 billion in emergency funding to rebuild the system.

Homeland Security Secretary Markwayne Mullin, whose department is investigating the root cause, said there is no connection between the FAA failure and this week's worldwide Microsoft outage, Fox News reported. The BBC likewise reported that U.S. officials attribute the breakdown to old equipment overloading, not to a cyberattack or the Microsoft problem. Officials have stressed that travelers were kept safe throughout, and halting departures while controllers could not count on their communications links was the cautious call.

The deeper lesson is one this administration has been pressing for months: a system that moves millions of Americans should not depend on equipment built for the 1980s. Duffy's request now arrives with a vivid example attached, and lawmakers of both parties will be asked to answer it.

Check your airline's app or website before leaving for the airport, and keep checking, because a flight that looks fine in the morning can be scrubbed by afternoon as crews are reshuffled. Rebooking through the app is often faster than waiting in the counter line.

Know your rights. Under federal rules, a passenger whose flight is canceled is entitled to a refund if they choose not to travel, regardless of the cause, Yahoo Travel reported. Meals and hotel rooms are a different matter: when a cancellation stems from something outside the airline's control, such as this government system failure, carriers are not required to cover them, though it never hurts to ask politely and keep every receipt.

And be patient with the gate agents, pilots and flight attendants working through the backlog. They did not cause Friday's failure, and they are the ones trying to get everyone home.

Liberty Bell Report will keep following the cleanup, the investigation and the fight in Congress over the fix.