US airlines and aerospace manufacturers insist they have no use for tariff protections, warning that the proposed Trump administration levies could eat into the healthy trade surplus the sector has enjoyed for more than 70 years.

At the request of President Donald Trump, Commerce Secretary Howard Lutnick's department launched an investigation on May 1 to determine whether to impose tariffs of between 10 and 20 percent on civil aircraft and parts, including engines.

The US industry those tariffs were crafted to protect swiftly let the administration know it was not interested.

"Imposing broad tariff or non-tariff trade barriers on the imports of civil aviation technology would risk reversing decades of industrial progress and harm the domestic supply chain," the Aerospace Industries Asso

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