Wow...I am trying to book a flight for a convention (waiting for a good deal that may never come) and one airline site gave 3 different wheelchair choices--wheelchair at gate, transport to plane, special in-the-aisle transport chair.  I don't remember which airline/service I saw that.  I just can't believe that if you type in a note about being deaf that they give you a wheelchair?!?  
Just supports my guiding philosophy in life:  Never ascribe to malice what can be written off as stupidity.
		
		
	 
Delta gives you two options, I believe, you can check if you have a special need.  One of the two options is Deaf/HoH.  Again, I suspect when you choose one of these, it just generates a "disabled" checkbox on the manifest...oh, wait, if that were true then the flight attendant would not have known I was deaf.  
 
  
Maybe I'll contact Delta and ask them why they send a wheelchair for deaf people.
Edit:  I sent a compliment to Delta (for the flight attendant and for the safety instructions being on the headrest TV) and then asked about the wheelchairs for deaf/HoH.