CT,
The information below was taken directly from the USPS Web site...........Andy - Las Vegas

Mail Service News Release

FOR IMMEDIATE RELEASE
September 17, 2001 - 9PM
Release No. 01-081

Letters take to air as Postal Service delivers to all Manhattan, Toll-free customer information number announced

WASHINGTON, DC - The U.S. Postal Service announced today that First-Class letters are beginning to take to the air via commercial airliners.