Cost. SR-71 was very expensive to operate. LA Times article from 1989 when it was discussed (the first time; the SR-71 was retired twice): http://articles.lat

Cost. SR-71 was very expensive to operate. LA Times article from 1989 when it was discussed (the first time; the SR-71 was retired twice): http://articles.latimes.com/1989-04-09/opinion/op-1582_1_air-force-chief-blackbird-spy-plane http://articles.latimes.com/1989-04-09/opinion/op-1582_1_air...