Atlanta-based Delta is now selling hand baggage only (HBO) fares on many routes linking Europe with the US.
Delta brands its HBO fares as “Basic Economy” and these are valid for flights departing on or after April 10.
However at the time of writing they are only available on the Atlanta route departing the UK.
But a search on the carriers website revealed that Basic Economy were offered ex-UK over indirect routings (in this case via Amsterdam/Paris CDG) with KLM/Air France codeshare services
Source: Business Traveller