gods-eye-view/changelog.d/795-opensky-compress-cached-body.md

• Compress the live flight snapshot on the wire. /api/flights gzips its cached global snapshot and its regional adsb.lol fallback once per refresh and sends that frame to clients that offer gzip: about 860 KB becomes about 250 KB. Other clients get the same bytes uncompressed, and both answers carry Vary: Accept-Encoding (daikaginza, #795).