For instance, Air Europe did not own any of the shiny, new aircraft in its fleet. (These were usually procured on highly favourable terms from the manufacturers and then sold upon delivery to ILG's in-house leasing subsidiaries, such as AE Finance or AE Norsk, or to third party lessors, such as Guinness Peat Aviation (GPA), from whom the airline subsequently leased them back. This enabled it to keep them off its balance sheet, thereby being relieved of the financial burden resulting from the aircraft's depreciation, while keeping a substantial interest in the aircraft's residual values, which were booked as profits. This sale-and-lease-back activity was a central plank of ILG's corporate strategy. It also constituted a major part of ILG's business and accounted for a large slice of its profits.)