You can use airplane mode to avoid roaming charges when travelling. You won't be able to send or receive text messages or phone calls, or use data services, but you could connect to a Wi-Fi network to check your email or browse the internet.
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In situations where a power source isn't available, turn airplane mode on to stretch your device's precious battery life. Just remember that airplane mode disables your access to cellular data, so don't expect to be able to send text messages or make cell phone calls in this battery-saving mode.
If you turn on Wi-Fi or Bluetooth while you're in Airplane Mode, they'll be on the next time you use Airplane Mode, unless you turn them off while in Airplane Mode.
If he put it on flight mode, put it in his pocket and never took it out while you were together, it's likely he just doesn't want interruptions to his time with you. Even then, it would be more common to put it on silent, so that he could check from time to time that he could see who had been contacting them.
It's safer to have it on your phone when you fly, experts say. It's safer for everyone if you put your phone in airplane mode when you're flying. Cell phone signals can interfere with some of an airplane's crucial systems.
You can use WhatsApp internationally for free with Wi-Fi; depending on your cellular plan, you may incur international charges for using cellular data on WhatsApp. To preclude international data fees, you can turn roaming off on your phone and still use Wi-Fi.