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See attached, possibly relevant to the discussion (back from 2008).The port holes may be like the YF-23, built into the skin, just cannot see them (or taped over for the rollout) with the sensors mounted to the back of the skin/panel or maybe laser air data? I wonder if the B-21 will use an AINS? AINS was a very pricey piece of equipment but worked very, very well and very reliable.They may be taped over like AINS window during B-2 rollout. Or it may be lasers (those require apertures too though).Notice no visible air data ports on the aircraft.
Also, I was under the impression the black dots seen in the B-21 intakes from the pics of the rollout were air data sensors? But I might remember wrong...