RIO DE JANEIRO, June 6 (Reuters) - Some airlines are delaying decisions to exercise aircraft purchase options amid uncertainties related to the war in Iran, which has pushed up jet fuel prices significantly, Embraer ( EMBJ ) CEO Francisco Gomes Neto told Reuters on Saturday.

While the Brazilian planemaker has not seen requests to defer deliveries or a slowdown in active sales campaigns, Gomes Neto noted caution was emerging around incremental commitments.

"Some companies that could be exercising previously signed options are leaving that a bit further ahead to better understand how the situation will evolve," he said on the sidelines of the International Air Transport Association's (IATA) annual summit in Rio de Janeiro.