Qatar Airways held my Dad's luggage hostage!

My dad had planned his trip half a year in advance. We made sure his passport, tourist visa form, and luggage were all ready to go. I went as far as to place air tags in his luggage. I dropped him off at the airport on Tuesday morning. Later in the day, he arrived at the Seattle Tacoma Airport. From there, he flew to Doha, Quatar.

When he landed, he gave me a call. As we were talking, I checked the location of the airtags. That's when I saw that the location of the luggage was still Seattle Tacoma airport. I told him right away to file a complaint.

He spoke to them, and they told him he can file a complaint once he arrives at his final destination.

Redditors, is there anything my dad can do at the moment. He will need his luggage Pronto as his meds were packed inside?