Got the date?

Today's Brain Bender...

Following the pattern, fill in the missing number below.

• May 5
• October 11
• March 9
• April ?

Okay, you know the drill. Answer to be found later in the comments...

Update: Looks like we need a clue. So here you go. Consonants and vowels are the key.

Update #2: Whoohoo! We have a winner!! Wxman got it in one. Way to go Wxman! And thanks for playing everybody!