Delta Air Lines has found an effective cost-cutting strategy in the purchase of 49 used McDonnell Douglas MD-90s, which they have revamped with new interiors and paint, this feature says. These jets safely fly as new planes do, but shave about 10% off the cost of operating per seat over a new Boeing 737. Delta's cost-cutting strategy has enabled the carrier to pay down debt, improve aircraft interiors and invest in Wi-Fi while also enjoying its third consecutive year of profitability.

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