Example flight toggle command for bukkit

gistfile1.java

public boolean onCommand(CommandSender sender1, Command cmd1, String label, String[] args) {
  if(sender1 instanceof Player) {
    Player p = (Player)sender;
    if (CommandLabel.equalsIgnoreCase("fly")) {
      if (!p.isFlying()) {
        p.setFlying(true);
        p.sendMessage(ChatColor.DARK_AQUA + "[Fly] " + ChatColor.YELLOW + "Flight mode enabled!");
      } else {
        p.setFlying(false);
        p.sendMessage(ChatColor.DARK_AQUA + "[Fly] " + ChatColor.YELLOW + "Flight mode disabled!");
      }
    }
  }
}