About middle names...
 

I don't know the answer to your question.

Just want to say middle names is not customary in every culture. I hate it so much when my hyphenated Chinese given name gets "divorced" and the system forces me a middle name (i.e. my partial given name) that I never have. Citi even asked me what my middle initial was in one occasion. When I told the CSR that I didn't have one but their system "created" one for me. The CSR insisted I had to give it to him before we could proceed. :rolleyes:

As for OP's worry, I've read enough threads on FT to know that tickets with no middle name shouldn't be a problem.

I felt deprived when I was younger that my parents did not give me a middle name, but not anymore..... ;) :D

Getting correct credit
 

Well..

The main concern will always be: is my name correct on the ticket and will I get mileage credit. Sometimes the tech system does not recognize if name if not spelled out in full.

Mileage credit: that's the ticket.

That's gotten ordinarily without much trouble -- missing mileage credit and/or making sure the correct account number is in the correct field at time of booking and check-in should make that a non-issue for most all customers in the situation of the OP.

Thanks for the reassurance everyone! Just wondering:

When I booked my ticket (I purchased online), I don't recall them asking for any government ID# or anything to identify me, just a name and credit card. How do airlines know it's me that booked the ticket? I do remember when I was younger all they did was swipe my passport and they found my ticket (even though I didn't give them the passport # before). Also I remember in e-checkin swiping the credit card I used and then located my booking, but that makes more sense...

Your name and photo ID usually does the job for airlines. If the airline is concerned about the legitimacy of the ticket payment and you used a credit card, then some airlines reserve the right to ask for the credit card before allowing the passenger to check in.