Boeing has looked at options "from mild to wild" for the design of a proposed mid-market jet, a senior executive said, hinting at a breakthrough that industry sources say will create building blocks for future models.

Marketing Vice President Randy Tinseth said Boeing would leapfrog reported plans by Airbus to update its hot-selling A321neo, as Boeing eyes a gap between narrow-body jets and long-haul aircraft for a potential new midmarket airplane.

"We have looked at the mild and we have looked at the wild and I can tell you we know that if you are going to address that market, you need a new airplane," Tinseth said after a two-day meeting of airline leaders in Mexico.