Pilot Finance, Inc.
Pilot Finance, Inc. has a uniquely tailored repayment structure that works perfectly with student pilots who want to flight train 1 - 5 times per week.  The repayment schedule is based on how many lessons you have per week.  Their intent is to help you fund a license or rating, but not to help with an entire commercial pilot program.  Pilot Finance's only business is pilot financing, so they know this business. 

Check out the details on their website
AOPA offers loans for flight training.  No matter what stage of training you are in, they have a program to help you complete your training.  Check out the article on the program here.  

Here is the link to their loan website:
AOPA Flight Training Loans