May 16, 2018 5:20 pm Frontier Airlines Passengers Stranded at PHL Frontier Airlines is responding after dozens of Puerto Rico-bound passengers were left stranded at Philadelphia International Airport for a second day. Now frustrated passengers are speaking out. US & World Videos 1:44 Pro-Palestinian protesters remain on UPenn's campus despite warnings to disband 1:30 Protests calling for ceasefire continue at Penn 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out 0:20 Teen girl shot in Southwest Philly, suspect in custody 0:27 FBI inspects American Airlines plane at PHL after bomb threat