Allocated landing slots may have a commercial value and can be traded between airlines. Continental Airlines paid US$209 million for four pairs of landing slots from GB Airways at London Heathrow Airport, $52.3m each.[7] The highest price paid for a pair of take-off and landing slots at Heathrow Airport was $75m, paid by Oman Air to Air France–KLM for a prized early morning arrival, reported in February 2016. A year before, American Airlines paid $60m to Scandinavian Airlines.[8] As supply is limited, slot trading became the main solution to enter Heathrow and transfers grew from 42 in 2000 to 526 in 2012 and over 10 years the average priced slot was equivalent to £4 per passenger.[9]