"Air does not need rescuing. But plummeting paratroopers do. Don't get confused."
Air rescues are tier 9 in the Placebo industry. The unlock requirement needs fewer comrades than Laser Drills and Fusion Plants. However, the placebo cost is a massive jump in difficulty compared to the last four generators, so 33 M bonus is recommended for this generator. Also, the researcher who automates this industry, Zap McNicoy, unlocks at Rank 120. Upgrading discount for this generator may not be necessary, especially if your production is high, as the lab cost is the same as Laser Drills and Fusion Plants, and unlike previous generators, Rank 119 did not have a pre-auto mission.