N661US: The First 747-400

Delta's Ship 6301 was the first 747-400 built. It began as a Boeing and Pratt & Whitney test aircraft before entering Northwest service, then joined Delta following the airlines' merger. The same airframe is now the museum's 747 Experience.

Aircraft identity

• Registration: N661US
• Variant: Boeing 747-451
• Serial number: 23719
• Former registrations: N401PW
• Operator history: Boeing and Pratt & Whitney test aircraft; Northwest from 1989; Delta following the 2008 merger until 2015
• Record status: Preserved

Aircraft history

Date or period	Milestone
29 April 1988	First flight as N401PW; used for engine testing before airline delivery. Source
8 December 1989	Delivered to Northwest Airlines as N661US. Source
2008	Joined the Delta fleet following the Northwest merger. Source
9 September 2015	Final flight, Honolulu to Atlanta, after more than 61 million miles. Source
30 April 2016	Moved to the Delta Flight Museum. Source
28 March 2017	Opened as the 747 Experience exhibition. Source

What makes this aircraft important

The exhibit includes the upper deck and a view behind the cabin walls. Check the museum's opening information before visiting; aircraft access follows its own schedule.

Status and access

The official collection or venue record lists this aircraft at Delta Flight Museum, Atlanta. Interior access, tours and opening arrangements can change. Check the venue information before visiting.

Sources checked: 3 October 2026. Dates are as specific as the confirming source; an undated milestone is labelled as a period rather than given an invented day.

Related

• All individual aircraft histories
• The 747-400