Rainmaker Technology’s bid to deploy cloud-seeding flares on small drones is being met by resistance from the airline pilots union, which has urged the Federal Aviation Administration to consider denying the startup’s request unless it meets stricter safety guidelines.

The FAA’s decision will signal how the regulator views weather modification by unmanned aerial systems going forward. Rainmaker’s bet on small drones hangs in the balance.

The Air Line Pilots Association (ALPA) told the FAA that Rainmaker’s petition “fails to demonstrate an equivalent level of safety” and poses “an extreme safety risk.”

However, Rainmaker CEO Augustus Doricko said an email that all of the union’s objections are based on only the public notice, rather than non-public documents submitted to the FAA that

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