Yes, passengers are allowed to use both programs to speed up airport screenings. The Clear helps verify identity through biometrics, while TSA PreCheck fastens security lane clearance. Travelers using TSA Precheck Clear together can bypass regular ID checks and also get faster PreCheck lanes. They have to enroll in both programs separately, but using them together helps to maximize the efficiency at participating airports. For further details, one can go through the blog on the Airlines Group Travel website.