Comparing distance between two Points inside a FME Aggregate.

Why not join the points with a LineBuilder (group by whatever attribute you are using in your FeatureJoiner) and then measure the line rather than creating aggregates?

The reason this doesn't work is in some cases I have multiple Suppliers to single Requestor. I use the FeatureJoiner with Left Join and this will create me two separate features, each with a set of two points in the FME Aggregate. After this transformer, If I did a LineBuilder with group by, it is going to try and group all the points sharing same ID I used for FeatureJoiner into a single line. Which I don't want.

After using the above suggestion I finally solved the issue using LineBuilder. However I needed to add a unique key before the FeatureJoiner for all my Suppliers. I could then do the FeatureJoiner with same attributes as before. Then in the LineBuilder I could again use those same attributes I used in FeatureJoiner plus the unique key attribute I created to the GroupBy, to keep separate results.

The distance was then done with GeographicLengthCalculator.