JetBlue passengers as of this week can e-mail and instant-message during their flights, as the airline has become the first domestic carrier to provide such services free in-flight. JetBlue partnered with Yahoo! Research in Motion and LiveTV to provide customers with online capabilities for such Wi-Fi enabled products as laptops and BlackBerrys. The airline has designated its Airbus A320 aircraft outfitted with wireless networks as "BetaBlue."

To celebrate the new in-flight services, JetBlue is holding a four-day sale for travel in January and February, with some blackout dates. Fares include $139 from Boston or New York JFK to San Francisco; $49 for intra-California flights between Long Beach and Oakland; and $99 from New York JFK to Puerto Plata, Dominican Republic (service begins January 10) or St. Maarten (service starts January 17). Flights must be booked online by December 14. Visit www.jetblue.com. (JM)