When you are traveling out of the country, you can still use WhatsApp account via mobile data or Wi-Fi. If you use a local SIM card while you are traveling, you can still use WhatsApp with your home number.
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To text while flying, you'll need to use a messaging app like WhatsApp, Apple iMessage, WeChat or Facebook Messenger. These Over The Top applications don't require a cellular network connection and instead send messages through the internet.
Cruise ships have cellular service that you can connect to. However, it's usually considered international roaming and means you'll be charged high rates to access. You likely know that instead of using a cell signal, you can hook your phone up to wi-fi and use the Internet to make calls, send texts, and surf the web.