HOUSTON (AP) -- United Airlines has one of its 787 aircraft back in the air.

A 787 Dreamliner took off today as scheduled at 11 a.m., Central time, from Houston for Chicago.

The Boeing 787s were grounded for four months because of smoldering batteries. The incidents included an emergency landing of one plane, and a fire on another.

Federal authorities lifted the grounding order a month ago, but it has taken Boeing and the airlines a few more weeks to fix most of the planes.

United is the only U.S. airline currently flying the 787. The grounding forced it to delay planned international flights, and reduced its first-quarter earnings by $11 million.

Passengers don t appear to be worried. United says it saw strong demand for today s flight, starting on the first weekend that the tickets went on sale.

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