<p>Yes, as T26E4 explained, you were invited to apply for a fly-in. Fly-ins are essentially programs where rich universities pay to fly you out to their school to try to convince you to apply. It is typically extended to lower SES students, URMs, or students from underrepresented states. If you are accepted to a fly-in program, you are considered a very strong applicant for admission. </p>
<p>If you are interested in UPenn, I would definitely apply. </p>