Reasons Why Coventry Was Not A Success
Class G Airspace. Very much NOT a benign environment for pax jets to operate within combined with MAJOR problems for ATC to deal with.
Too close to Birmingham. Established & large scale operation with plenty of airlines , routes & frequency. Also, proximity caused ATC problems ( especially Coventry ATC).
Lack of facilities eg. Terminal, taxiways & parking. As said already, lack of investment.
TOM decision to withdraw from scheduled route operations.
Other than that: it had everything going for it !