Blackburn's small airliner in a 100-seat design question

What might Blackburn have designed if asked for a 100-seat airliner?

The panel points to the smaller CA15 as a comparison, correcting its capacity to ten seats and noting monoplane and biplane versions.

A hypothetical 100-seat Blackburn airliner leads to a search for earlier passenger designs. The aircraft eventually identified is the CA15, described as a ten-seater rather than the requested 100-seat aircraft. It is recalled as having both monoplane and biplane forms. The exchange therefore supplies a historical design comparison without establishing an existing Blackburn 100-seat airliner.