One could always try reading the AirdropSettings.json file or reading the Airdrop Server Guide linked on the mod's description page on Steam, packaged in the @Airdrop-Upgraded folder, linked everywhere in my Tech Support Discord (also linked on the mod's description page on Steam), and available online at...

https://games.digiacom.com/Airdrop_Server_Guide.pdf

Page 4, 1. Controls, j. MinimumPlayers: Minimum number of players logged into your server before random airdrops will be called (0 = always active, > 0 activates airdrops when there are at least this many players on the server) [integer].

 0, 5 or 10 players (any positive value >= 0, should not exceed server player limit).
 999 to disable all scheduled drops (anything greater than the server’s maximum player limit).