United Airlines decides to keep Boeing 787 in land until May

United Airlines said on Thursday that it will keep its six Boeing 787 on the ground until May 12 due to problems with batteries that suspended  flights worldwide.
United Airlines, the only airline in the United States with Boeing´s 787 in its fleet, had recently announced the decision to keep the planes on the ground until March 30.

The U.S. authorities continue to investigate the problem detected in the batteries of  the 787.