Britain's monopolies watchdog has said that BAA's ownership of seven UK airports may not be serving the interests of either passengers or airlines.
The Competition Commission said that it would suggest remedies in August, which may include demands for BAA to sell one or more of its airports.
BAA, owned by Spanish firm Ferrovial since 2006, controls the three major London airports – Stanstead, Gatwick and Heathrow – as well as Scotland's Glasgow and Edinburgh airports.
"There is no competition between BAA's three London airports, and only very limited competition from non-BAA airports (London City and Luton)," the inquiry's chairman, Christopher Clarke, said in interim report.
"Similarly, there is no competition between their two airports in lowland Scotland," he added.
Moreover, the Commission is also looking at whether the fiasco over Heathrow's terminal five was due to its position.
BAA welcomed the report and stated that the firm's ownership of the airports was in the public's interest.
Feeds