该计划被经济危机所取代，英国机场管理局和英国航空公司对希思罗机场进行了大量投资，这两家公司的严格控制阻碍了希思罗机场的复兴。
The scheme was overtaken by the economic crisis, and the stranglehold of BAA and BA, both of which have a lot invested in Heathrow, has prevented its revival.
规模经济和有限的投资选择会控制费用不会太高。
Economies of scale and limited investment choice will keep down charges.
控制固定资产投资规模。
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