Hi,
it happens even with the default trike aircraft, and no AES present;
if these information can help, my configs are:
display/graphics: framerate unilimited, trilinear, anti-aliasing on, global texture very high, only adv. animations checked
display/scenery: level large, mesh 100, mesh res. 1, text. res. 7, watter effects low 2x, land detail on, scen. compl. normal, autogen dens. normal, special effects high
hardware: i7-860 @ 4.0Ghz, 4 x 2 GB DDR-1333 @ 1440, nvidia gtx570