RTX (NYSE: RTX), the aerospace and defense company behind Collins Aerospace, is facing fresh cost pressure after the FAA estimated that tariffs could add roughly $100 million to its ongoing air-traffic-control modernization effort.

Shares fell approximately 1.1% to $191.49 on Friday, reflecting investor concern over the emerging cost dynamics tied to the sweeping infrastructure program.

The tariff impact looks significant in isolation, but it represents less than 0.8% of the program’s more than $12.5 billion in initial funding, providing some context for the scale of the overall initiative.

Collins Aerospace and Spain’s Indra jointly hold $780 million in contracts covering as many as 612 ground-based radars, placing RTX at the center of one of the most politically sensitive infrastructure buildouts in aviation history.

RTX is also committing $26.5 million to expand production capacity in Largo, Florida, a move designed to strengthen domestic manufacturing muscle as the modernization program accelerates.

That domestic expansion could help RTX manage supply-chain friction and reduce exposure to further tariff-related disruptions, positioning the company more favorably within a politically charged procurement environment.

However, increased production capacity does not automatically protect profit margins, as the contract split, pricing escalators, and ultimate profitability of the program remain unclear.

The valuation picture adds another layer of complexity for investors, with RTX currently trading 24.09% above its $154.31 GF Value, suggesting the market is already pricing in a sizable premium over GuruFocus’ estimate of fair value.

For investors weighing the opportunity, the modernization program represents years of potential demand, but the stock’s premium valuation means that execution and contract economics will matter just as much as headline order growth.

RTX’s ability to navigate tariff headwinds, manage its partnership with Indra, and deliver on the Largo capacity expansion will likely prove decisive in determining whether the company can justify its current market premium over the months ahead.