Bombardier has not flown the CSeries again now more than one week after completing the type's first flight in a highly-publicised event at Mirabel International airport.
Flight test schedules can vary greatly due to weather or small technical problems. The CSeries first flight on 16 September was itself delayed by at least a few days due to poor weather conditions in Montreal.
But first flights are typically followed-up with more take-offs and landings within the week of the big event. For example, the Airbus A350-900 had completed three flights, including a fly-by of the Paris Air Show, within a week of first flight on 14 June.
Bombardier did not respond to requests for comment about this article.
Company executives repeatedly brushed aside questions about the pace and schedule of follow-up tests and the arrival of the remainder of the test fleet.
Bombardier now says the CSeries is scheduled to complete a 2,500h flight test campaign.
Although Bombardier's second-quarter financial report stated the company would review the entry-into-service date upon completing first flight, company executives at the event said that the programme was still targeting delivery to launch operator Malmo Aviation in around 12 months after first flight.
The initial, 2.5h flight test appeared to go smoothly. The flight test crew felt confident enough to raise and lower the landing gear after reaching a cruise altitude of about 12,000ft.
The only blemish was what chief test pilot Chuck Ellis described as a minor subsystem alert message that appeared during the flight, but it did not prevent the crew from meeting all of their objectives.
Commenting after the first flight was completed, CSeries programme manager Rob Dewar said they would assess whether any changes would be necessary before attempting the next flight. Dewar described the assessment period as "just a matter of a few days".