The International Air Transport Association said international scheduled cargo traffic saw the pace of its recovery slow to 25.2 percent growth.

Just when shippers thought the worst was over, flight and service disruptions of volcanic proportions took place this spring. And when European air space finally re-opened, capacity was scarce and even more expensive on almost all global trade routes.

Many trucking executives believe that we’re on the cusp of a steady, prolonged recovery with solid price increases to match. Analysts aren’t so sure. But nearly all agree that shippers should expect rate increases when their contracts expire, some in the 3-percent to 5-percent range. Here are the four issues that are now in the driver’s seat.