Ms O'Conner said a rising birth rate and new housing developments had led to the shortage of places.
Dr Conner said they were concerned by the increase in the number of teenage smokers they found in their study.
Boeing's head of commercial airplanes Ray Conner said at a joint news conference with Ryanair on Tuesday that the problems with the 787s had not affected orders.
Boeing Commercial Airplanes President and CEO Ray Conner said in a statement that the company was pleased with the engineers' vote but "deeply disappointed" in the technical workers' rejection of what he called the company's "best and final" offer.
On Monday, Boeing's head of commercial aircraft, Ray Conner, said the company was ready to move quickly to fix the batteries if its proposed solution gets regulatory approval.
"We have a great deal of confidence in our solution set and the process for certifying it, " said Conner.
CNN: FAA approves proposal for fixing Dreamliner battery woes
"Working with internal and external experts in battery technology, we have proposed a comprehensive set of solutions designed to significantly minimize the potential for battery failure while ensuring that no battery event affects the continued safe operation of the airplane, " said Conner.
CNN: FAA approves proposal for fixing Dreamliner battery woes
"The Boeing team is ready to help get our customers' 787s back in the air where they belong, " said Ray Conner, who runs Boeing Co.
"United and Boeing share a rich history together and we are delighted United has chosen the 737 for its future fleet, renewing our partnership for decades to come, " said Ray Conner, chief executive of Boeing Commercial Airplanes.
"This is a comprehensive and permanent solution with multiple layers of protection, " said Boeing's head of commercial aircraft Ray Conner.
BBC: Boeing's Dreamliner battery fix approved by US regulators
Ray Conner, the head of Boeing's commercial airplanes unit, said Friday that Boeing is convinced about the aircraft's safety, and that the airlines that have bought the plane are also confident in its safety.
Ray Conner, president and chief executive officer of Boeing's commercial airplane unit, said in a statement that the company's focus has been on developing a permanent resolution.
CNN: FAA approves proposal for fixing Dreamliner battery woes
Boeing spokesman Doug Alder said the company is legally obligated to have discussions with SPEEA, but he noted Conner's statement about the importance of the 401k transition for future hires.
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