Do these hearing aids have a flight mode and how do I enter or exit flight mode?   

 Yes, the Kirkland Signature 10.0T hearing aids have a flight mode function that disables the wireless radio to comply with airplane safety requirements.   

1. To enter flight mode, the hearing aids must be turned off. 
2. Press and hold the lower part of the button. The green indicator light blinks approx. 4 times when the hearing aid starts up. 
3. Continue pressing the button for an additional one to two seconds until the orange indicator light blinks. The button is held down for a total of 7 seconds from start up. 
4. Release the button when the solid orange light indicates the hearing aid is in flight mode. 

To exit flight mode on Rechargeable hearing aid models  

Simply switch the hearing aid off and on again.