Our dramatis personae - some lawyers in federal court, in a lawsuit over a personal injury on an airplane.
Bartholomew Banino (BB) represents the airline.

Peter LoDuca (PL) and Steven Schwartz (SS) represent the injured person.

Here's the docket (via @questauthority) https://www.courtlistener.com/docket/63107798/mata-v-avianca-inc/?filed_after=&filed_before=&entry_gte=&entry_lte=&order_by=asc

On March 1st, PL files that reply/opposition to the motion to dismiss.

It cites a bunch of cases in support of its argument! They seem quite convincing - there's some state courts holding that state courts can decide international airline accidents. (See pages 4 and 5). https://storage.courtlistener.com/recap/gov.uscourts.nysd.575368/gov.uscourts.nysd.575368.21.0.pdf

On April 11, the court orders PL to produce copies of the cases. https://www.courtlistener.com/docket/63107798/25/mata-v-avianca-inc/ Likewise, on April 12, the judge asks for another case. https://www.courtlistener.com/docket/63107798/27/mata-v-avianca-inc/

(This is not necessarily so unusual - some judges have local rules requiring litigants to attach unpublished cases to filings to save the court from having to go find them.)