This is a Request for Proposal (RFP) for the purchase of one Boeing 737-700 or 737-800 aircraft, where the offeror must also include an offer to purchase the government's existing Boeing 737-400 aircraft and spare parts. The contract will be a Firm Fixed-Price award based on a best-value tradeoff, where technical factors and delivery are significantly more important than price. The issuing office is the US Marshals Service JPATS in Kansas City, MO. Proposals must be submitted via email, and the contractor must have an active registration in the System for Award Management (SAM). The final date for submitting questions is specified, but no budget or specific performance location beyond the issuing office is listed.