DESTROY ALL VOX ZEPPELINS!!! BIOSHOCK INFINITE

Seriously, I'M HAVING A VERY CRITICAL PROBLEM WITH THIS CHAPTERRRRR!!!
I kept losing! So, I've searched at google on HOW TO END THIS BAD CHAPTER (lol).
And this what I receive:

1999 Mode Tips

• A single gunship shows up; use the Songbird to destroy it.
• Two gunships show up; don't use the Songbird to destroy them. Instead, use the Songbird to kill the infantry they drop.
• A single gunship wielding a rocket cannon will show up; destroy the cannon with a weapon rather than the Songbird. The Sniper Rifle is one of the fastest ways to do this; target the actual cannon.
• Two gunships will show up, kill the infantry they drop using the Songbird. There will also be two RPG wielding enemies on the catwalks, throw them off using the Undertow Vigor. Remember it takes one bar to pull them in and another to throw them from the deck.
• A zeppelin will show up and drop two Motorized Patriots along with several other enemies. Destroy the zeppelin using the Songbird, take out the Motorized Patriots, then eliminate the rest of the enemies.
• Two more zeppelins will show up. Destroy the one which has a rocket launcher beneath it by using the Songbird, then eliminate the enemies it sends down. There will be two hovering gunships, don't bother taking them down.
• Destroy the final zeppelin and any remaining enemies on the deck of the ship.
  
  
  GOING TO TRY IT NOW!