Delta Air Lines said Friday morning it was considering the extension of a waiver issued this week to Boston travelers, "and of course, we'll work with customers on a case-by-case basis if they're not able to travel because of infrastructure challenges, " wrote Delta representative Morgan Durrant in an e-mail.

CNN: Boston transit shut down; airport open

For trainers who only want e-collar functions (and no BarkLimiter), Garmin offers the Delta in a basic configuration with three training configurations (instead of five) and half-mile range.

ENGADGET: Garmin announces new dog collars, talks up 'Bark Odometer'

The first to arrive is Adam Smith, who was a fellow Phi Delta Theta at the Massachusetts Institute of Technology before dropping out to start an e-mail search company, Xobni.

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