Unfortunately, your hands are tied with the iPhone in Airplane Mode. It won't be possible for Find My to locate and display the iPhone.
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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 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.
What does airplane mode do? 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.
Airplane mode, when turned on, allows you to turn off all communication functions of electronic devices at once. When traveling abroad, you can connect to Wi-Fi while in Airplane Mode to use the Internet with peace of mind.
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.