LONDON (Reuters) - Canada's Bombardier (>> Bombardier, Inc.) is confident of winning another substantial order for its CSeries jet in 2017, said senior vice president Colin Bole, who also played down speculation about launching a bigger version of the airline.

Bombardier received a pivotal order for 75 of the jets from Delta Air Lines (>> Delta Air Lines, Inc.) earlier this year, as well as one for 45 of the jets from Air Canada (>> Air Canada).

However, orders have since been smaller for its two CSeries models which have between 110-130 seats.

Bole, senior vice president for sales and asset management at Bombardier Commercial Aircraft, told reporters that he was confident of another Delta-sized order next year, adding that a big order was unlikely before the end of this year.

Speaking to reporters in London, the executive also played down speculation that Bombardier was looking at building a bigger version of the plane which would compete with best-selling Airbus (>> Airbus Group) and Boeing (>> Boeing Co) models that carry at least 150 people.

That was in line with a previous report and Chief Executive Alain Bellemare's comments that the company's focus is on the existing two models.

(Reporting by Sarah Young; Editing by Keith Weir)