I flew Frontier for the first time in late January, OKC-LAS connecting thru DEN obviously. Gate agent explained it as a tail swap, informed us that the 100 or so pax with a connection would miss their connections, gave us numbers to call for rebooking, and that DEN would be able to assist with vouchers and accommodations.

When we finally got to board, I was needing a seat reassignment with some others, a gate agent asked if we wanted to know what happened. She told us it was a "biohazard issue" with a passenger on the incoming flight. I immediately assumed one of the lavs had a problem, but as she explained more, this "issue" occurred in his seat, affected 2 rows, and the pilot refused to fly the plane after it happened. (I don't blame him...) As we boarded, the pilot is coming over the intercom explaining this situation as well and telling the folks in rows 6, 7, and 8 they should be thankful that we swapped planes. I get rebooked for the next morning to LAS, and Frontier offers me a best-rate hotel voucher, and tells me since it wasn't weather-related, I should be able to contact CS and get a refund for the hotel cost.

I finally received a reply back from Frontier and they are telling me "In this case with all delays and cancellations, we are unable to assume liability for additional incidental or travel-related expenses." I'm not one to complain, but I'm wondering if I should push the issue on being reimbursed for this - I'm not asking for the night of hotel I missed in LAS, just the unexpected night in DEN. Thoughts?

A passenger caused situation is an uncontrollable situation, especially since it was so many people missing connections, F9 cannot be expected to compensate.