Fox News Flash top headlines for April 21 Fox News Flash top headlines are here. Check out what's clicking on FoxNews.com. NEW You can now listen to Fox News articles! "Alligator Alcatraz," an immigration detention center in the Florida Everglades , can remain open, an appeals court ruled on Tuesday, upholding its earlier decision to block a judge's order for the facility to wind down operations for failing to comply with federal environmental law. In a 2-1 decision, the majority on the 11th