I left my iPad in a plane. What do I need to do to keep info safe. I know it is locked with Touch ID but can they over ride the locks.

See if the following articles can help:

• If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
• iCloud: Erase your device with Find My iPhone - Apple Support
• iCloud: Lock and track your device using Lost Mode in Find My iPhone - Apple Support

If you haven't already, I strongly suggest that you also do the following:

1. Go to Manage your Apple ID and change your Apple ID password.
2. Contact the airline and report the iPad as left on the plane.
3. Whatever, you do, DO NOT disable Find My Phone for this device.