Wall Street aerospace analysts are becoming increasingly concerned that Boeing will fall short of its goal to maintain 777 production rates at the current 8.3/mo through the introduction of the 777X, planned for entry-into-service in 2020.

One analyst predicts a rate reduction from 8.3/mo to seven and then to five as 2020 gets closer. Others are beginning to hint that they won’t be far behind in lowering expectations. But don’t tell this to Randy Tinseth, VP Marketing for Boeing.

“We have things in the pipeline and we’re working on those,” he told us July 1. “We’re confident the sales will come home and we’re confident we’ll bridge the gap.”