The T-28 aircraft operated through most its years of service with support from NSF. Stable funding through a cooperative agreement since 1986 is responsible for the survival of the digital data and its documentation that is the core of the archive. In addition, field project support was provided by a variety of sources, including NSF, NOAA, NASA, and the Federal Aviation Administration. NSF funded the development of this data archive. All of this support is most gratefully acknowledged.