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Delta and United's hub-and-spoke model largely to blame for continued delays
Delta (DAL) and United's (UAL) hub-and-spoke flight model is largely to blame for more disruptions, specifically for Delta (DAL). This model concentrates flights and crews in a few major hubs ...
Investopedia9y
Analyzing Porter's 5 Forces Model on Delta Air Lines
The supplier, by contrast, is unlikely to find another buyer capable of replacing the sales volume represented by Delta. A substitute, as defined by the Five Forces model, is not a product or ...