Brexit jitters are causing some firms to re-evaluate their British investments, but U.S. aerospace and defense sector giants Boeing and Raytheon say they're staying put.
Speaking to CNBC at the U.K.'s Farnborough Airshow, John Harris, CEO of Raytheon International, said the outcome of the U.K.'s referendum on European Union (EU) membership wasn't prompting a scare.
"We've been here in the U.K. for the better part of 100 years. We've got a strong company here, thousands of employees, fantastic capability and we intend to remain here," Harris said.
Harris called Brexit a "long play," saying it would be years before the details of the U.K.'s exit from the EU were known. Meanwhile, "we're very, very enthused about the opportunities and see no meaningful change in the short term," he said.
"While these changes are of import and concern, our job is to really understand the marketplace, make adjustments as needed, and remain a trusted partner," Harris added.
Dennis Muilenburg, Boeing chairman and CEO, said it was too early to tell what sort of impact Brexit would have on his company.
"We don't see a significant impact right now," Muilenburg told CNBC at the Farnborough Airshow. "We have much longer-term perspective in our business."
On Monday, the U.K. government confirmed it has signed a contract to buy nine new P8 Maritime Patrol Aircraft from Boeing. That's on top of a $2.3 billion deal for 50 of Boeing's new Apache AH-64E helicopters, which are set to be in use by the British Army in 2022.
"We've doubled our presence in the U.K. over the past five years (and) we're going to continue to invest here. We don't really see our plans changing," Muilenburg said.