Originally Posted by
EsherFlyer
Even that doesn't always work. BA offer same fare bucket (say L) as Basic which is handbaggage only or Plus with checked bag and free change on day of travel. Hence my question as to what sub-OP was looking for. ITA can find L availability and will give Plus price. Basic can then usually be booked as well at chosen point of sale.
BA's basic economy fares are currently filed as private fares, so IATA doesn't see them.