This also suggests the Allegiant/Viva joint venture is going to have to be shelved for now. In 2015, they applied for antitrust immunity for a joint venture, and that was put into place during 2017 after approval. Now, DOT is getting more serious with three filings:Part 213 Order requiring Mexican airlines to file schedules with the DOT for all their US operations. The first two are fairly fluffy, just requiring Mexican airlines to file schedules and require all charters to be approved. The secondary assumption here is that the end of Aeromexico/Delta also means that the Allegiant/Viva joint venture would never be approved.