Later regns include N977PS, XA-MEP, YV-37C, XA-TAE, XA-ASS, and XA-PAL.

This 727 was delivered originally to Northwest Airlines as N465US March 2, 1965. in April 1977, PSA bought and re-registered it N978PS. Northwest leased it back in October 1982 and actually bought it back in January 1983. Reverting to N465US, it remained in the fleet until January 1992. The aircraft went to Africa with Kabo Air as 5N-MAM until 1995 and then to Transafrik International as S9-TBA. It was broken up at Luanda, Angola in 1996.

North West's 727-51 on a photo sortie over Washington's mountains shortly before delivery on 12 November 1964. It served the airline until sale to PSA as N973PS in March 1977. Small 'North West Orient' titles and 'Fan Jet' wording. Obtained from Boeing over 40 years ago.

Pulling up from LGA's r/w 04 with the smog of New York hanging in the background, this 727 served Northwest from 11.64 to 5.77 when sold to PSA as N973PS. Leased to Mexicana as XA-MEN for two years from 9.80 and back to Northwest after return, reverting to original reg in 1.84. Donated to Wentworth Inst Tech 9.92 and grounded at Hanscom Field, MA as a training aid