Reuters reported that certification can take five years or more and require extensive testing, data and documentation. The FAA proposed modernization measures in June and is examining ways to reduce exemptions, special conditions and equivalent-safety findings.

The 737 MAX 7 took more than eight years to receive approval, while Boeing's 777X program is more than five years behind its original schedule. Duffy also argued that long timelines can deter private investment in new aviation programs.

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This is an original summary, not a republication of the full report.

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