When using Aircraft Summary, care should be taken when grouping by Seat OEM / Seat Support OEM / Seat Model. The metrics returned are representative of the aircraft that have the Seat OEM / Seat Support OEM / Seat Model fitted, and therefore when summed may be greater than the total fleet.
For example, in the sample search below, the first row indicates that 604 737 Max aircraft are fitted with Collins Aerospace manufactured seats, and those aircraft have 104,939 seats fitted. It does not show the market share of Collins Aerospace seats on the 737 Max.
To build a seat market share report, run an Aircraft Detail search including Seat OEM / Seat Support OEM / Seat Model, export the data and pivot on the required data.