301-10.117—May I keep compensation an airline gives me for voluntarily vacating my seat on my scheduled airline flight when the airline asks for volunteers?
         Yes:
    
    
    
        
        (b) 
         If additional travel expenses, incurred as a result of vacating your seat, are borne by you and are not reimbursed; but
    
    
        
        (c) 
         If volunteering delays your travel during duty hours, your agency will charge you with annual leave for the additional hours.