(CNN) A typo is keeping President Obama from signing legislation designed to end budget-related FAA air traffic controller furloughs blamed for widespread flight delays, a congressional source told CNN Saturday.

But the fix is going into effect anyway, and the system will be back to normal by Sunday, the FAA said.

Apparently the holdup boils down to an “s” needing to be added somewhere in the Senate version of the bill — it’s not clear which word is the culprit.

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