Shelly McClaskey and her family planned to spend Christmas in Los Angeles with family but canceled their flights a few weeks before the trip due to COVID-19 shutdownsin Southern California. The insurance company executive wasn't eligible for a refund and happily accepted $878 in Southwest Airlines credit because the suburban Chicago family travels three or four times a year and goes out of its way to fly Southwest. She didn't think about the money again until a couple of weeks ago when she tried to book three tickets from Chicago to Baltimore for a late-June trip to her teenage son's la...