Does anyone know what this is?

The submitted content does not contain sufficient factual information to support a professional analytical summary. What has been provided is a casual Reddit post consisting of a single question, a speculative comment about a flight school or air show, and a link to an image that is not accessible. No aircraft type has been identified, no operator has been named, no location or date beyond what can be inferred from the Reddit image URL is established, and no verifiable facts are present.

To generate the kind of analysis requested — covering key developments, operational relevance for working pilots, and connections to broader aviation trends — there must be a substantive source article with identifiable facts. A Reddit post asking "does anyone know what this is?" does not meet that threshold.

If the underlying subject of interest is why certain aircraft do not appear on ADS-B tracking platforms like FlightRadar24, that is a legitimate and well-documented topic — covering military exemptions, the FAA's Limiting Aircraft Data Displayed (LADD) program, formation flight transponder practices, and Part 91 ADS-B equipage rules — and a proper source article on that subject could be analyzed in full. Please resubmit with a substantive news or trade publication article.