You can type an airplane symbol using a keyboard with a numeric keypad if your computer is set to support this input method. If you don't have a numeric keyboard or typing the symbol doesn't work on your computer, you can copy and paste the airplane symbol.
Press "Num Lock" on your keyboard to enable the numeric keypad.
Press and hold "Alt" on your keyboard.
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Type "+2708" on the numeric keypad to input the airplane symbol.