This is a follow-up Sources Sought notice for the F-15SA Programmed Depot Maintenance program, intended for market research only and not a request for proposal. The entire program will cover a total of 145 F-15SA aircraft, with the first 4 jets inducted under the basic contract for validation and verification. Potential contractors must identify the existing facilities where they would perform the work, as the UIL inspection is critical for flight safety. The government is requesting industry feedback on the Performance Work Statement, Work Specification, Government Furnished Equipment list, and a Rough Order of Magnitude price estimate. No budget amounts, submission timelines, or performance location are specified in this notice.