The escorting J-20s were taking off from Yuhong AB(on the western outskirt of Shenyang city), home base of the 46th and 47th Regiments, 16th Surveillance Aircraft Division.
J-20 under the shelter/hangar at the northern end of the AB
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Could there be four J-20s for this event?
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Note these shelters/hangars at northern side of the airbase are for the Y-8/9 type surveillance aircraft
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A backup J-20?
A "Rapid Raptor" style deployment?
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Doing "Rapid Raptor" ("Rapid 20"?) deployments -- characterized by small scale redeployments from their home bases, done so relatively quickly and being able to operate from their non-regular bases -- is something we've seen hints of in the last few years when we've seen transient deployments of 2-4x J-20s at any one time to smaller air bases.
J-20 numbers (and 5th generation numbers as a whole) will take a while to get to where the PLA ideally wants them to be in terms of total fleet size, so the ability to rapidly redeploy their available airframes to a given theater of action will be very important.
Additionally, it is likely that opfor nations will recognize that the regular air bases that operate J-20s as high priority targets and seek to strike them in event of a conflict. The ability to distribute the J-20s and their supporting crews and logistics tail in small packages that can be spread out among different bases will be quite important.