S. 4335 modifies the aviation workforce development grant program to help more organizations successfully apply for federal funding and expand training opportunities. The bill allows the Federal Aviation Administration to set aside up to 2 percent of annual appropriated funds from 2025 through 2028 to provide technical assistance to eligible grant applicants, helping organizations navigate the application process. Additionally, the bill directs the FAA to consider giving preference to applicants who commit to recruiting underrepresented populations in aviation, serving rural and regional airports, or partnering with minority-serving institutions and public colleges. This legislation aims to address workforce shortages in the aviation industry while promoting more equitable access to training opportunities across different regions and communities.