Previously you did not need an eVisa if just connecting through the airport to a destination outside Kenya, but it's not clear whether that has changed, and you need ETA as the site says all passengers require it and makes no distinction between transit or entry.

We will be transiting through the airport from JFK to SEZ on KQ with a 10-hour connection in NBO in March. We don't plan to leave the airport on this leg. On the way back we have an 18-hour connection and had planned to enter the country on an eVisa and do an excursion to the Nairobi National Park, Sheldrick Wildlife Trust, Giraffe Centre etc. Does anyone know if we need ETA for one or both legs? or do we still need an eVisa for the return and dont need anything when transiting. I know its early days and there seems to be a lot of confusion, but we don't want any nasty surprises if I mess up the required paperwork!