The founder Paulo Venâncio da Rocha Vianna initially invested heavily in technical training for both land and air staff conducted particularly by TWA.
[1] Later NAB tried also to fly between Rio de Janeiro and Recife via the coast but it had no success due to the fierce competition with Serviços Aéreos Condor (later Cruzeiro do Sul) and Panair do Brasil.
The end of World War II brought a boom in the creation of new airlines in Brazil and due to fierce competition, in order to survive, NAB was granted further two loans.
This was however not the end: the Federal Government decided to take over NAB and continue services in the states of Rio de Janeiro, Minas Gerais and Espírito Santo.
[2] In 1957 the entrepreneur Dilvo Peres decided to invest in the airline, re-organizing its administration, buying new aircraft, and establishing an operational partnership with Panair do Brasil.