Question: do pens explode on planes?
Answer: The typical rollerball may explode mid-flight, or malfunction after returning to earth. ... Other types of pens—ballpoints and gels—are almost never affected by altitude changes the way rollerballs are. So the cheapest way to have a "airplane-safe" pen is to buy a ballpoint (like a Bic) or a gel pen (like a PIlot G2).