Proponent takes great pride in developing and maintaining relationships with our supplier partners, to provide the broadest possible portfolio of aircraft parts to serve our aftermarket customers better. But we’re way more than just parts. As a value-added distributor, we work hard to offer services and solutions that add value to your organization.

Below are some of the ways that we add value to our partner organizations.


Proponent has always known the value of technology in improving efficiency and decreasing cost and time. Our e-commerce offerings allow our customers to place orders 24/7 from anywhere in the world, with the confidence that the parts you need are always just a few clicks away.



We know that “AOG” are the three worst letters in aerospace. Well, we’ve got three words for you: “We’re on it.” Our AOG services help you get your plane back in the air – where it belongs. Proponent’s global network means that your vital parts are always close by, serving our established customers from two of our largest warehouses in California and the Netherlands.

We make sure your AOG is A-OK ASAP.


Call + 1 (205) 650-4938 Ext. 3


When your aircraft or your fleet need scheduled maintenance, you don’t want to waste a minute waiting on parts. We apply industry data and historical usage trends to create forecasts that make sure that the parts you need are where you need them, so the only downtime you have to worry about is once you’ve finished the job early.


Let us help make your recurring maintenance procedures more efficient by collecting the necessary parts together, in the order of their use. With all the time and hassle you’ll save, you’ll wonder how you ever performed scheduled maintenance without our custom kits.



Proponent’s consignment programs bring the parts you need on site. Inventory planning and automated replenishment mean greatly reduced transit time and zero hassle. The parts you need, where you need them – ready when you are.


The more parts you can get from a single vendor, the more time and money you save. With over 400,000 parts and components supported, Proponent is well qualified to be that vendor. And if you need something that we don’t stock, our long-standing relationships with manufacturers and other aerospace distributors mean that no part is out of the question. Let us shoulder the cost and burden of getting you exactly what you need, when you need it.


We value communication and transparency in all of our relationships, which is why we’ve gathered our Quality Systems & Approvals, our VAD Approvals and our Customer Terms & Conditions on one page for easy reference.

If there is any way we can help you outside of the information provided here, please don’t hesitate to let us know by emailing


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