The Mission Support System (MSS) is an open source software package that has been used for planning flight tracks of scientific aircraft in multiple measurement campaigns during the last decade. It consists of many components, a data-retrieval tool chain, a wms server which creates 2-D figures from 4-D meterogical data. A client application for displaying the figures in combination with the planned flight track and other data. For data exchange between participants a collaboration server is used. The talk describes how we used these components for a campaign.