Will be flying LUF to FRA in January from EWR and transiting through . Arriving in the morning and thought to stop at a lounge and then go to the city for the day . Returning for the 2nd leg to CPT in the evening and plan on visiting a lounge before flight . So 2 visits morning and afternoon/night . I will be with 2 friends and have both priority pass and lounge key . I think PP allows for 2 guests ,but if there is a issue can I use PP and Lounge key at the same time ?