National airspace system
Subtitle: in-flight assistance operational concept, NAS-SR-1328
Series: NAS-SR -- 1328; NAS-SR -- 1328.
Publisher: U.S. Department of Transportation, Federal Aviation Administration
Published: 1988
Place of publication: Washington, D.C.]
Language: eng
Subjects: Airports; Traffic control; Air traffic control; Planning
Other titles: In-flight assistance operational concept, NAS-SR-1328.
Notes: Cover title.

Shipping list no.: 90-0350-P.

"September 1988."