Congress can seldom be accused of moving too quickly, but that appears to be the case with the legislation that put air traffic controllers back to work after furloughs caused thousands of flights to be delayed.

The Senate and House passed the bill at a breakneck pace late last week. President Obama had planned to immediately sign it into law, but administration officials tell ABC News he's not expected to sign it until Tuesday — after a spelling error in the legislation is fixed.

The culprit, apparently, is a missing ‘S’ in the bill.

Read more at ABC News.