It has taken more than 14 years, but Priceline.com is about to complete a round trip.

Fueled by a strong second-quarter earnings report, the company's stock is closing in on its dotcom-era high after a wild ride that took it from nearly $1,000 a share down into the single digits—and back.

The catalyst for the most recent leg was a jump in summer travel bookings, which helped the online airline and hotel reservation service post a 24% increase in profit to $437 million on Thursday. Revenue jumped 27% to $1.68 billion.

Bookings surged ...

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