Biggin Hill Airport wants to increase bank holiday and weekend opening times to increase the number of flights.
Director William Curtis said he feared the airport could be asked to help the UK meet increased demand for air travel if the extension was not granted.
Bromley Council has approved new hours "in principle".
The airport, which caters to the business and general aviation sectors, is pushing for an hours' extension on weekdays, five-and-a-half hours' extra flying time on Saturday, and a further four-hour increase on Sundays.
Mr Curtis was asked whether he was "scaremongering" about taking holiday airlines during a BBC London interview.
He said: "What we will do is to ensure that we have set our stall out in the business and general aviation sector and we won't therefore be potentially looked at later by government as a solution to the capacity crisis."
Councillor Stephen Carr, leader of Bromley Council, said the move had the needs of residents versus those of a successful airport "at the heart of" it.
Bromley Council said the length and timings of the extension were yet to be decided, and would be subject to noise controls and monitoring.
The agreement follows an eight-week consultation period which saw 76% of respondents support the plan, it said.
In total, the consultation received more than 41,000 responses, with 31,500 coming out in support of the proposals and about 10,000 against.
However, some have expressed concern at the council's decision.
Hugh Bance, of Bromley Residents Against Airport Development, said there were 200,000 people living under the flight path who would be affected.

The Â£200,000 work on Kingsway will include new signs, re-marking and remodelling of the road.
Safety barriers were installed after the death of Sgt Louise Lucas in March, to stop pedestrians crossing.
Another man was hit by a bus on 4 August, while Daniel Foss, 37, died in 2013.
Swansea council is also considering introducing a dedicated cycle track as part of the changes.
It said the work to prevent public transport travelling in both directions is a pre-cursor to more detailed plans to redevelop the route as a business district.

The bank's monthly Purchasing Managers' Index (PMI) is a survey of a panel of firms that tracks indicators such as new orders, employment and exports
It had shown growth for 17 months in a row but in December it indicated a slight drop in economic output.
The bank's chief economist said it is not clear if this is a blip or if it signals "the start of a significant deterioration in business conditions."
Richard Ramsey said that Northern Ireland is "not unique in experiencing an economic slowdown".
The equivalent PMI survey for the UK shows the weakest rate of growth in 19 months, while global output growth slipped to a 14-month low in December.
Mr Ramsey said external economic conditions have a major bearing on Northern Ireland's economic performance, particularly for exporters.
Economic stagnation in the Eurozone and the wider global economic slowdown has impacted upon the local manufacturing sector in particular.
Northern Ireland's manufacturing firms reported their first decline in output, new orders and employment since mid-2013.
The economist said it was "perhaps concerning" that Northern Ireland's slowdown has been more marked than the rest of the UK.
However, he added that with Northern Ireland's two most important trading partners - the UK and the Republic of Ireland - are still posting strong rates of expansion and said this should drive growth in the local economy for some time to come.
A small London airport needs to extend its hours to avoid being forced to take on holidaymakers and more commercial airlines, its boss has claimed.
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Following a number of deaths and serious accidents on a main route through Swansea, a new one-way system will be introduced in the autumn.
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The NI economy stalled in December, research by the Ulster Bank suggests.