To the best of my knowledge, Northwest used every version of the 747 (except the -300) right up to its merger with Delta, which in turn used the -400s up to early this year. The incomparable "Queen of the Skies" was best known as the workhorse of Northwest's trans-Pacific route network. By the way, I hope you can find and upload air-to-air footage of Northwest's, or Delta's, 747-400.
To the best of my knowledge, Northwest used every version of the 747 (except the -300) right up to its merger with Delta, which in turn used the -400s up to early this year. The incomparable "Queen of the Skies" was best known as the workhorse of Northwest's trans-Pacific route network. By the way, I hope you can find and upload air-to-air footage of Northwest's, or Delta's, 747-400.
Also they didn't use the SP, the SR and the 400D.