Passengers enter Seattle-Tacoma International Airport in Seattle, Thursday, May 31, 2007. It's been a busy summer travel season for the major airlines, with some carriers posting record occupancy loads on their planes. Airline profits for the April-June period are expected to be higher than a year ago when the carriers begin reporting second-quarter results this week. But the outlook isn't all clear skies. Analysts have lowered their earnings forecasts – in some cases by double-digit percentages – out of concern over everything from high fuel costs to summer storms.