This is a strange situation I am in.
Due to flight delays, I was rerouted into the US through a different airport.
My initial route London-->Philadelphia was changed to London->DC->Philadelphia.
However, my luggage was sent in a flight the next day directly to Philly. So I could not take the luggage through Customs at my port of entry, which was DC.
Now the flight is a codeshare flight. Although BA handled the luggage in London, my final carrier is United (Domestic) who seems to be clueless about the procedures. However, my lost luggage claim is handled by United.
I was notified that the luggage was held at Customs in Philadelphia airport. However, the airlines doesn't seem to know what to do next and asked me to contact Customs myself, which is ridiculous.
What is the standard protocol in this situation?