"Airlines have also complained loudly about increased DST. When DST was lengthened, the Air Transport Association estimated that the schedule-juggling necessary to keep U.S. flights lined up with international travel would cost the industry $147 million. DST hurts other transportation interests, too: Amtrak is known to halt its overnight trains for an hour when clocks change in November so they don't show up and leave from their 3 a.m. destinations early. In the spring, trains have to try to make up lost time so they can stick to the schedule.
"DST might also cost employers in the form of lost productivity. A 2012 study found that workers were more likely to cyberloaf -- doing non-work-related things on their computers during the day -- on the Monday after a DST switch. Study participants who lost an hour of sleep ended up wasting 20 percent of their time."
-- Rachel Feltman, "Five myths about daylight saving time", 2015-03-06
[I hate the time change a little bit more each year even though my personal schedule is mostly pretty flexible. My first choice would be to stay on standard time year 'round -- let clock-noon stay close to solar-noon, eh? -- but I would be nearly as happy just staying on DST year 'round. This switching back and forth is stupid. If your business needs a different schedule when days are shorter, or if you personally prefer a different schedule then, just change your hours for those months -- don't change everybody's clocks. *grrrr*]