Within hours, the Democratic Senatorial Campaign Committee sent out news releases chastising GOP senators from Arizona, Illinois, Missouri, New Hampshire, Pennsylvania, Iowa and Ohio who are facing Democratic challengers this fall for siding with the airline industry over passengers. The bill also contains aviation policy provisions that lawmakers have been working on for more than four years, including greater access for drones to the national airspace and protections for airline passengers chafing at fees for basic services such as checked bags and ticket changes. [...] Thursday, the Senate overwhelmingly approved amendments seeking to boost security at airports and other transportation hubs in response to last month's attacks in Brussels, as well as the downing of a Russian airliner in Egypt last year that is suspected to have been caused by a bomb planted by an airport worker. —Make more federal grants available to train law enforcement officers in how to prepare for and respond to active shootings at transportation hubs and other "soft targets." —Authorize TSA to donate unneeded security equipment to foreign airports with direct flights to the U.S., permit increased cooperation between U.S.