Delta Air Lines has issued a stark warning that proposed tariffs under a national security investigation could severely disrupt its operations, potentially grounding flights for millions of passengers annually. In legal documentation submitted to the US government and shared with Fox News Digital, Delta objected to possible tariffs stemming from a Commerce Department probe into the national security implications of imported aviation equipment. The airline cautioned that "without providing time to adjust, any potential tariffs would not only threaten Ushanufacturing of aircraft, it would also inhibit Delta's ability to purchase aircraft produced domestically or abroad."