If you are doing multiple shots, then you don't have to worry. Pixel rejection should be able to "delete" them on the final integration.
If you have just a single exposure, and want to remove it, then it is a lot more work. One (easy/tedious) way is to use the Clone Tool. Another option would be an image segmentation, i.e. create a new image with just the line painted, and then you may use the DefectMap process to erase the line.
If the sat trail is a straight line, you may segment it with the Linear Hough Transform, and a script that interprets the output image, finds the line, and draws the defect map. Not that easy, but elegant.
