Board Thread:Questions and Answers/@comment-141.6.11.13-20140113180533/@comment-15636815-20140113184733

Well, feel free to continue wanting it. It's not going to happen.

The developers already rewarded you for delivering those resources by giving you things after each contract. Also, you can use those leftover resources to build things at the contractor's station. You may wish to visit Maximum Passengers Per Hour to see which are the best things to build. Other than that, there's no way to do anything with the leftover resources.