These machines can change their operations based on traffic volume, number of subscribers or devices that are being connected, or on the number of services that are being used.

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An interim solution involves setting up high-volume spay-and-neuter clinics that can do dozens of operations a day for a fraction of what a full-service vet charges.

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Restricted to lower-volume airports, contract towers nonetheless handle 28 percent of all domestic airport operations.

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