remember it is MWAA (not WMAA, and certainly not WMATA - the entity that runs Metrorail and Metrobus) - which is why they prefer to be known as the Airports Authority - but I digress.
Here are the details of the solicitation:
Microsoft Word - RFP-20-23657A - STATEMENT OF WORK.doc (mwaa.com)
and all the RFP documents are here:
mwaa.com - RFP-20-23657A: Rehabilitation and Upgrade of Plane-Mate and Mobile Lounge Vehicles, IAD
Good info in there on how the project is structured. The first two are pretty much "proof of concept" then it will be 6 units at a time as ops allows. Over the entire project, the cost per unit is ~$3.3m for 49 units. (A journalist never let facts get in the way of a preferred narrative, right?).
Note that the MWAA mobile lounge division techs have pretty much been fabricating almost all parts in-house for well more than 10 years as there is no OEM support. The engines were last refurbished almost 20 years ago. All new engine packages are needed.