Complaints about airline service grew during the first half of this year as consumers reported more concerns about airfares, according to a report released Tuesday by the U.S. Bureau of Transportation Statistics. The report said the U.S. Transportation Department received 9,542 complaints about U.S. airlines, foreign carriers and others in the travel industry from January to June 2015, a 20.3 percent rise from a year earlier. Complaints nearly tripled to 870 about fare levels and about the information carriers provide on fares during booking, marking the largest jump.