Gardaí have released the names of the two people killed in the aircraft crash in south Connemara yesterday.
The men were pilot Matthew Masterson (59) of Parkmore Drive, Terenure, Dublin, and Paul McNamee (57) of Lake Road, Loughrea, Co Galway.
The Air Accident Investigation Unit (AAIU) is examining the site where the small aircraft crashed injuring seven others.
The single-engine Cessna aircraft was returning from the Aran island of Inis Meáin when it crashed while attempting to land at Indreabhán at around 2 pm yesterday afternoon.
Another passenger is in a critical condition at University College Hospital Galway today, while two others were described as being "serious but stable".
An AAIU spokeswoman said arrangements were being made to transport the wreckage to the unit's facility in Gormanstown, Co Meath later, today where tests on the engine and fuselage can be carried out.
AAIU inspector Paddy Judge said he hoped to speak to some of the survivors later today.
He said that up to now investigators have been concentrating on the technical aspects, with an examination of the site carried out. He said the speed the aircraft crashed at, its power setting, if it was technically fit to fly, and the meteorological conditions would also be studied.
The group of eight businessmen on board had been en route home in the private aircraft after attending the annual general meeting of the Clifden Airport Company on Inis Meáin.
They have associations with the Clifden Airport Company, which sold its ownership of an airstrip site at Cleggan, serving Inishbofin island, to the Government earlier this year.
The plane appeared to miss the runway at Indreabhán some time around 2.45pm. Witnesses said the plane landed, nose first, in gorse and scrubland close to the airport terminal.
Three of the nine on board were able to scramble from the wreckage.
The weather was poor at the time, with west to northwesterly winds and bad visibility. Galway airport had been forced to divert two of its flights to Shannon.