...Sale Date: Mar. 6, 2019. Series: $30,000,000 Maryland Department of Transportation (Baltimore/Washington International Thurgood Marshall Airport Shuttle Bus Fleet Acquisition) COPs, Series 2019. Purpose: Acquisition of clean diesel buses for airport parking shuttle services. Security: Maryland Department of Transportation's (MDOT) COPs are payable solely from purchase installments to be paid by MDOT pursuant to the purchase agreement, subject to annual appropriation by the Maryland General Assembly....