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Exclude flights where the outward flight was undertaken more than 12 months ago.
Exclude air travel by people whose jobs it is to fly by plane e.g. pilots/cabin crew/crop sprayers/air ambulance etc.
Ask these people to think only about flights they made for their own purposes.
Do not include flights from RAF bases.
Do not include trips made simply for the pleasure of going on a plane rather than to get somewhere.
Universe
Adults, aged 16 or over, living in private households in Great Britain.;National
Sampling
Multi-stage stratified random sample
Study Type
Repeated cross-sectional study, monthly (up to year 2000), eight cycles per year (up to April 2005), monthly thereafter.