ForeFlight now allows you to add a call sign to flight plans. Since most pilots don’t use call signs, the setting is disabled by default; you can enable it in More, Settings, File & Brief. Doing this will cause a Call Sign field to appear in the flight plan form underneath the Aircraft field. Enter a call sign contraction and number in the field to file the flight under that call sign; your N number will be included in the flight plan’s remarks so ATC can still access it. If you don’t enter any call sign the flight will be filed under your N number. Call signs are used extensively not only by commercial operators, but also by charity organization like Angel Flight, and can provide benefits such as special handling by ATC.