A flight in IMC for which the pilot and/or the aeroplane is unable to comply with the requirements of IFR

A VFR flight cleared by ATC to operate within a CTR in meteorological conditions below VMC

A VFR procedure to enable an aeroplane to transit a control zone or area in IMC without compliance with IFR

Any flight cleared by ATC to operate in conditions less than VMC in which the pilot is required to remain clear of cloud and in sight of the surface