Pack a pen in your carry on. You usually have to fill out forms to enter a country. Most airlines don’t stock for each passenger and Flight attendants cannot give their personal pen out as they need it for emergencies, like writing medical information down if someone falls ill. It is better to use ink to fill it in. Just don’t bring a fancy pen. Those gel filled, roller ball pens ALWAYS leak. Stick with a cheap Bic ballpoint that you won’t mind losing if the person next to you needs to borrow it.