JetBlue Airways and Spirit Airlines filed an appeal late Friday of the federal court ruling from earlier this week that had blocked their proposed merger on antitrust grounds.

The two-page appeal filed after the market close on Friday did not lay out any legal argument for the appeal. It simply notified the court that the two airlines would be going forward with their efforts to combine and form the nation’s new fifth largest airline.

The airlines had previously signaled they disagreed with the decision to block their merger.