According to Aptos tweet:
2/ Users who completed an application for an Aptos Incentivized Testnet /OR/ minted an APTOS:ZERO testnet NFT are eligible to claim Aptos tokens (the original user who minted the NFT is eligible, not the current owner).
I have registered to AIT-3 (not selected as participant). I am not minting NFT. I think I should be eligible for the airdrop according to the tweet above.