A cozy snooze will now come at a cost on some JetBlue Airways flights.

The airline said yesterday that it had begun offering "eco-friendly" blankets and pillows to passengers on flights longer than two hours. The take-home kits replaced JetBlue's once-free pillows and blankets and cost $7.

It's the latest in a string of fees that airlines have been tacking on to previously complimentary amenities, including food, beverages and luggage check-ins. The controversial charges have come as airlines struggle to generate extra revenue to help offset the fast-rising cost of fuel and a lagging economy that has kept many travelers at home.

But JetBlue downplayed the cost of the kits, saying each came with a $5 coupon to Bed Bath & Beyond and would not add a significant amount of revenue to the company.

JetBlue, a low-fare carrier that already charged passengers for headphones and some beverages and movies, promoted the "advanced technology" of its new products. According to the airline, the plush pillow is made from a fabric that "blocks all micro-toxins larger than 1 micron in size," such as dust mites, mold spores, pollen and pet dander.

The airline isn't the first to impose a fee for naptime comforts. Ultra-low-cost carrier Skybus Airlines, which ceased operations in April, had charged $15 for a pillow and $8 for a blanket.

At Bob Hope Airport in Burbank, Calif., yesterday, JetBlue passenger Dina Rodriguez complained that the new kits were adding to the already high cost of air travel.

"Seven dollars? I think that's ridiculous," said Rodriguez, 23. "If that's the case, I'll just bring my own blanket."