Other Aircraft

I see in all my charts, a line called “Other Aircraft”, what do these number represent concerning the type of aircraft.

In my case, I think those are mode s messages, and it seems mostly commercial planes from which I have not received a complete ADS-B messages, or maybe older planes that do not have „full“ ADS-B?

The other aircraft are mostly planes that only send mode-S messages.
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Friend of mine was impacted by the latest blackout on Tenerife island which lasted for a couple of hours.

Since the power came back, the number of “other” aircraft went up significantly higher than the days before the blackout:

image

can this be related to the power outage or is it just be chance?