The 10 biggest US airlines have warned that the impending switch-on of 5G mobile phone services will cause "major disruption" to flights.
They said the start of Verizon and AT&T 5G mobile phone services, planned for Wednesday, would cause a "completely avoidable economic calamity".
Airlines fear C-band 5G signals will disrupt planes' navigation systems, particularly those used in bad weather.
The warning was issued in a letter sent to US aviation authorities.
The chief executives of American Airlines, Delta Air Lines and United Airlines were joined by others in saying: "Immediate intervention is needed to avoid significant operational disruption to air passengers, shippers, supply chain and delivery of needed medical supplies", including vaccine distribution.
The BBC has seen the letter outlining their urgent concerns. It was sent to Transportation Secretary Pete Buttigieg, as well as the head of the Federal Aviation Administration (FAA), the chair of the Federal Communications Commission and the director of the National Economic Council.
The BBC understands that negotiations are continuing at the highest levels of the US government about what has been described as a "very fluid situation".
The group of airlines said: "Airplane manufacturers have informed us that there are huge swathes of the operating fleet that may need to be indefinitely grounded.
"In addition to the chaos caused domestically, this lack of usable wide-body aircraft could potentially strand tens of thousands of Americans overseas."
In an update on Sunday, the FAA, which oversees aviation safety across the US, said it had cleared "an estimated 45% of the US commercial fleet to perform low-visibility landings at many of the airports where 5G C-band will be deployed".
The FAA added that it had approved "two radio altimeter models that are installed in a wide variety of Boeing and Airbus planes".
"Even with these new approvals, flights at some airports may still be affected," the regulator said.
"The FAA also continues to work with manufacturers to understand how radar altimeter data is used in other flight control systems. Passengers should check with their airlines if weather is forecast at a destination where 5G interference is possible."
https://www.bbc.co.uk/news/business-60036831
They said the start of Verizon and AT&T 5G mobile phone services, planned for Wednesday, would cause a "completely avoidable economic calamity".
Airlines fear C-band 5G signals will disrupt planes' navigation systems, particularly those used in bad weather.
The warning was issued in a letter sent to US aviation authorities.
The chief executives of American Airlines, Delta Air Lines and United Airlines were joined by others in saying: "Immediate intervention is needed to avoid significant operational disruption to air passengers, shippers, supply chain and delivery of needed medical supplies", including vaccine distribution.
The BBC has seen the letter outlining their urgent concerns. It was sent to Transportation Secretary Pete Buttigieg, as well as the head of the Federal Aviation Administration (FAA), the chair of the Federal Communications Commission and the director of the National Economic Council.
The BBC understands that negotiations are continuing at the highest levels of the US government about what has been described as a "very fluid situation".
The group of airlines said: "Airplane manufacturers have informed us that there are huge swathes of the operating fleet that may need to be indefinitely grounded.
"In addition to the chaos caused domestically, this lack of usable wide-body aircraft could potentially strand tens of thousands of Americans overseas."
In an update on Sunday, the FAA, which oversees aviation safety across the US, said it had cleared "an estimated 45% of the US commercial fleet to perform low-visibility landings at many of the airports where 5G C-band will be deployed".
The FAA added that it had approved "two radio altimeter models that are installed in a wide variety of Boeing and Airbus planes".
"Even with these new approvals, flights at some airports may still be affected," the regulator said.
"The FAA also continues to work with manufacturers to understand how radar altimeter data is used in other flight control systems. Passengers should check with their airlines if weather is forecast at a destination where 5G interference is possible."
https://www.bbc.co.uk/news/business-60036831
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