For the past couple of years, US Airways has supplemented its traditional daily nonstop to Frankfurt with a second summer-seasonal flight, with “summer seasonal” for the route being from early April through late October. That, despite the merger with American Airlines and the resulting switch from the Star Alliance (main European player: Lufthansa) to One World (main European player: British Airways), was the plan for this year as well. Or at least the plan until this past weekend, when US Airways updated its schedule, which shows the second flight now ending in mid-September. Such close-in flight schedule changes are rare and are a clear sign that CLT-Frankfurt bookings are disappointing at best this fall. It’s also another sign that there’s likely to be a lot fewer flights on offer to Europe from Charlotte in the summer of 2015 as compared to this year.