BAE Systems Avro RJ85 regional jets will be able to operate from high-elevation airports following approval of a modification for the four-engined type.
The modification enables the disabling of a system which automatically deploys passenger oxygen masks above a certain altitude.
Aircraft lessor Falko - which emerged from the spin-off of BAE's leasing arm - has developed the high-altitude modification in co-operation with the original equipment manufacturer.
It will allow the RJ85 to operate at airfields with elevations up to 13,400ft (4,080m), far higher than the previously certificated limit of 8,000ft.
Falko says the change is exclusively available on its aircraft and was approved by the European Aviation Safety Agency towards the end of 2012.
It says the modification, which is provided as a kit, allows the triggered release of oxygen masks to be overridden.
"We're in the process of signing up [the first customers]," says executive vice-president of sales and marketing James Greenstreet, adding that the company has two or three prospective clients with aircraft used in differing operations.
While BAE also produced the RJ100, the RJ85 has been identified as the more likely candidate for high-elevation airfield service - notably in South America where carriers operate British Aerospace 146s to remote airports.
"With the addition of the high-altitude modification our fleet of RJ85 aircraft are now able to operate to those airfields which until now have been out of reach to the type," says Falko sales and marketing director Chris Sedgwick.