And why should the 'army' (for army read HM Forces) be ordered in to bail out a profit making foreign company? Hitting these people in their profit, dividend and wallet is the only language they understand. All they need to do is visit a cold foreign airport (Helsinki, Moscow, Calgary), look at their snow plan and equipment, and copy it. It is not rocket science, and although it costs money they should be financially compelled to make the investment, because they should be made to reimburse the airlines for all of their delays/cancellations/inconvenience and expense, because the airport operator were unable to achieve what they are required to achieve - keeping the airport operating.
Using an already overworked HM Forces every time a private company fails to make a contingency plan and underinvests is not the answer, it will merely encourage them to continue to underinvest on the basis that the manpower is available to bail them out.