The possibility of crossovers between the 9-1-1 shows gets a disappointing update from a leading Fox executive. In recent weeks, the first responder franchise got a massive update when it was announced that the original 9-1-1 series had been canceled at Fox and will move to a different network. 9-1-1 season 7 will now debut on ABC. As for the 9-1-1: Lone Star spinoff, it was renewed for season 5 and will continue to air on Fox. The decisions, which were the result of complicated and costly rights fees, added doubt to any future collaboration between the two popular dramas.

https://screenrant.com/911-lone-star-crossover-possbilities-update-fox-exec/