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If the thrust-to-weight ratio is larger than the local gravity energy , then flight can happen with none ahead movement or any aerodynamic lift being required. Lift/drag ratio additionally determines the glide ratio and gliding range. Since …

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The fare paid is a contribution to the operational costs of the transport system concerned, either partial or complete. The portion of operating costs lined by fares – the farebox recovery ratio – typically varies from 30%-60% in North America …