St. John's was the starting point for the first non-stop transatlantic aircraft flight, by Alcock and Brown in a modified Vickers Vimy IV bomber, in June 1919, departing from Lester's Field in St. John's and ending in a bog near Clifden, Connemara, Ireland. In July 2005, the flight was duplicated by American aviator and adventurer Steve Fossett in a replica Vickers Vimy aircraft, with St. John's International Airport substituting for Lester's Field (now an urban and residential part of the city).
Try to answer this question if possible (otherwise reply "unanswerable"): What aircraft did Alcock and Brown use in 1919 for their flight?
Vickers Vimy IV bomber