Delta Airlines is now offering wireless Internet service on board some flights between Washington D.C., New York and Boston. Delta says it will expand the Wi-Fi service to its entire fleet — including planes operated by its Northwest subsidiary — by next summer.

Earlier this year American Airlines and Virgin America began selling in-flight Wi-Fi.

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Increasingly, some Internet service providers are placing limits on their broadband services. Comcast, for example, forbids customers from transferring more than 250 gigabytes of data per month. Customers who go over the limit risk getting dumped. Time Warner is experimenting with a tiered service, charging extra to customers who go over their monthly data limit.

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