 Barrel is projected to head north towards the Gulf of Mexico later today. For NPR News, I'm Emily Green. With the nation's airlines seeing an uptick in travel during the summer months, perhaps not surprisingly, the number of complaints is also on the rise. Transportation departments have received nearly 97,000 passenger complaints last year. That was up from around 83,000 the previous year. More than two-thirds of the complaints filed dealt with domestic carriers.