I am travelling from State College (USA) to Madrid (Spain) with American Airlines. I have a flight from State College to Philadelphia and 3-hour layover before my second flight from Philadelphia to Madrid. My ticket includes a checked bag.
The same day of my flight, my friend is driving to Philadelphia by car in the morning and I would like to skip the first flight and go with her to visit a museum before my second flight.
The issue is that I have paid for the tickets, and in order to get my company in Spain to reimburse me for my transportation costs (this has been business travel) I need to present the original boarding pass of the two flights. So, my idea is to go early in the morning to the airport, get the two boarding passes, go to Philadelphia by car with my luggage and then from there take the second flight. I am not sure if this can be done. Can I directly check my luggage once I get to the airport in Philadelphia?