For Sale: OneWay Trip on a Private Jet. No Waiting.

LOOKING for a bargain weekend flight from New York to Florida? One Sky Jets may have just the ticket, assuming you have ,500 to spend, and you can find a return flight.

The ,500 doesn't sound much like a bargain until you compare it with the ,000 that a private jet flight might otherwise cost.

One Sky Jets is one of a growing number of Web sites catering to this era's true jet set - private jet aficionados willing to spend thousands of dollars on a one-way flight as long as it does not involve security lines, airport parking garages and competition for overhead baggage space.

Because private jet passengers typically remain at their destinations for a few days, their pilots often fly back to their home airports after the drop-off. As a result, the nation's 5,000 or so private jets that offer charter flights travel empty 40 percent of the time.

Aircraft owners are happy to fill those planes even at greatly reduced prices, to help defray the costs of maintenance and storage. The Internet at least gives private jet operators a place to market their so-called empty-leg flights, rather than forcing travelers or travel agents to canvass carriers to find who may have an available flight.

The online market for private jet bookings is rising, executives at One Sky Jets, Jets.com and other flight brokers said, because of advances in booking technology on the part of private jet operators, and at Web sites that are serving them. The category itself is still comparatively small, with industry executives estimating that about 200,000 people in the United States fly privately each year, either on their own jets or through charter companies.

But with some studies indicating that the superrich are accumulating more wealth, and with commercial airline travel reaching new heights of inconvenience, that number could spike. And high-income travelers with at least some sense of financial austerity and a flexible schedule say that booking online beats owning all or part of a private jet, which can cost 0,000 annually.

Take James Gay for one. Mr. Gay, a resident of Fredericksburg, Va., owns retail and real estate businesses and has used private jets twice in the last year when flying with Suzie, his 12-year-old mutt, so she can avoid the conditions imposed on pets who fly on commercial airlines.

Mr. Gay said that by booking online through One Sky Jets, he typically spent about ,500 for each leg of a cross-country trip, which, he said, was considerably less expensive than the cost of a flight booked through a fractional ownership program. In such programs, through Blue Star Jets, Sentient Jet and others, members often pay 0,000 or more for the right to book a last-minute flight on a private jet, and are debited hourly fees for each flight.

"Even though I was doing it for the dog, I tried to do it so the cost was reasonable in my head," Mr. Gay said. "This was a great value."

Such flights can be a lot less expensive than they appear, since prices from private jet operators include all of a plane's seats. Greg Johnson, One Sky Jets's chief executive, said that on many flights between New York to Florida, for instance, buyers manage to fill the plane, putting the cost for each passenger at about ,500. That is still substantially more than a first-class ticket on a major airline, but the perks are considerable. "At an awful lot of airports you can actually pull your car up to the airplane," Mr. Johnson said. "There's none of this ‘arrive an hour early and park in the remote lot' stuff. And once you're on the plane gourmet caterers can provide you with almost any meal."

Mr. Johnson would not disclose his site's revenue, since his company is privately held, but he said that sales doubled in the last six months despite an "extremely modest marketing spend."

One Sky Jets, which started in 2004, represents the second wave of Internet sites in the category. The first wave came during the dot-com boom, when companies like FlightTime.com and CharterHub.com received tens of millions of dollars from venture capitalists who believed that the Web could help private jet owners find their customers more easily than in the pre-Internet era. (Many of the companies have since folded or changed hands.)

During that first wave, though, many private jet operators lacked the technology to help Web sites reliably track and predict the availability of their aircraft. Consumers, too, may not have been ready to trust a Web site with a ,000 booking.