Get Airport Design Editor, a free download, and use it to exclude any tree you desire anywhere you encounter this problem. This is a sophisticated airport design program, and the manual must be read before it's use. Also, you must have the deluxe version of FSX and install the SDK.
MSI P55-CD53, Intel i7-860-3.7Ghz, NVida GeForce 560 - 1GB, 4GB SDRAM DDR3 1333, WD 750GB-7200rpm-32MB, Windows 7-64 bit
Acer 23"WS LCD and Benq 19" LCD, CH yoke and pedals, Logitech Extreme 3D Pro, TrackIR 5, FSX Deluxe w/Acceleration, UTX-USA, GEX, ASE, WOAI, ADE, FSDS