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While reading the NTSB report on the crash of ALM Flight 980, I came across this interesting tidbit:

... The fuel charts used for the study made allowance for a higher consumption rate than the standard DC-9-30 series aircraft. This was the result of a fuel audit by the Douglas Aircraft Company on ONA aircraft and was due to jet assisted takeoff fairings installed on those aircraft. [Pages 7-8 of the paper report; pages 12-13 of the PDF file of the report. ONA = Overseas National Airways, who operated the flight on behalf of ALM. Emphasis added.]

Did these DC-9s ever actually use RATO during revenue operations?

EDIT: "Revenue operations" here means "any flight conducted for monetary compensation".

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    $\begingroup$ When you say "revenue flight" do you mean a passenger operation, or any flight for money? They were never used for passenger flights, but they were used by Overseas National in high/hot fields for military contracts in cargo operations. $\endgroup$ – Ron Beyer Mar 27 '19 at 21:38
  • $\begingroup$ @RonBeyer: Any flight for money, editing question accordingly, would you like to make that an answer? $\endgroup$ – Sean Mar 27 '19 at 22:27
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The JATO/RATO retrofits were used only by Overseas National (later National Airways) when operating out of hot/high airfields for military contracts. They were never used as passenger flights, but you could say that these were "revenue" flights as they were done for monetary compensation.

I can't find any history on ALM980, only that it was registered as N935F and operated by Overseas National as a passenger flight. N935F does not show any history in the FAA registry other than it being reserved. It is possible that this was a converted cargo aircraft.

Here is a picture of an Overseas National flight using the JATO rockets:

enter image description here
Source: UT Dallas

It should be noted that the DC9 was not the only passenger type aircraft to get the "JATO" treatment. Boeing modified the 727 to operate out of short fields by adding JATO rockets. Aviation Week did an article featuring the DC-9 JATO modifications:

enter image description here
Source: Aviation Week (article paywall)

The magazine cover linked above shows a DC-9 take-off (an Overseas National flight).

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