According to CNN.com
"As of 1:30 p.m. EDT, Dorr said, all 40 to 50 domestic airliners that had remained in the air had landed. By about 5 p.m. EDT, the FAA said all international flights that were in the air had landed at West Coast airports."

So, all domestic airliners had landed by 1:30pm and international flights by 5pm on Sept. 11.
Source(s):
http://archives.cnn.com/2001/TRAVEL/NEWS/09/11/faa.airports/index.html

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