The DC-8 was originally equipped with airbrakes on the lower rear fuselage, but these were quickly removed. Wikipedia says that they were removed before the DC-8 entered service:
[...] Douglas made a massive effort to close the gap with Boeing, using no fewer than ten aircraft for flight testing to achieve FAA certification for the first of the many DC-8 variants in August 1959. Much needed to be done: the original air brakes on the lower rear fuselage were found ineffective and were deleted as engine thrust reversers had become available...
However, according to the CAB report on the crash of United Airlines Flight 859, the first few DC-8-10s, at least, did have airbrakes when they entered service, and at least one was using them as late as July 1961:
When this action failed to straighten the landing roll he knew the aircraft was going to leave the runway. He said he used the emergency airbrakes to slow the airplane as much as possible before leaving the runway. [...]
[...] The second officer said that after touchdown a series of events occurred which he could not place in sequence with any degree of certainty. He saw ejector indicator lights blinking, heard a foot thumper, saw the captain reach for the emergency airbrake handle, and saw that the aircraft was heading about 30 degrees off the runway. [...] [page 4 of the report]
And it’s definitely not misusing the term “airbrakes” to refer to the aircraft’s wing spoilers, since it refers to those as “spoilers” elsewhere in the report.
When were the DC-8’s fuselage airbrakes removed?