Pennsylvania December 15, 2023 7:45 am Frontier to start flying between Philly, Pittsburgh in 2024 Frotnier Airlines is connecting Pennsylvania’s biggest cities starting in the spring of 2024. US & World Videos 2:23 Philadelphia Style Mag celebrates 25 years with glamorous party 2:06 Days before UPenn's graduation ceremony, protesters take to the streets 2:04 One week after Kensington's homeless encampment was disbanded, new plans to clean the city revealed 1:51 Temple Dental School graduate is 6th in her family to achieve the accomplishment 2:25 Man accused of murdering roommate, spreading remains in different locations