There are thousands of people contributing ADS-B data many times a minute. You can't just "create a blockchain". Blockchains depend on hashing power for secur

There are thousands of people contributing ADS-B data many times a minute. You can't just "create a blockchain". Blockchains depend on hashing power for security. A new niche chain provides very little security, and a rich person like Elon could set up a hash cluster to out-hash everyone else and block updates for his jets. In order to fund hashing power and security, there has to be economic incentive for the miners. That requires some token, which ultimately requires everyone who submits updates to pay a fee. The reasons I and many other people provide ADS-B data to aggregation sites is that it's free (minus the one-time cost of the hardware) and I get something in return: a free upgraded account which, depending on the site, enables historical flight searches. If I lost money every time I provided data, it wouldn't make any sense to continue. I also wouldn't want to have to download an entire (or a good chunk of a) blockchain or raw data ledger to check history for a tail number. That's what I'd have to do if it were truly decentralized. Ledgers do not provide efficient indexing.