The details and current status of data requests submitted through the Data Request Help Desk page can be seen here.
History of Commercial Pilot Training
Data for the training time and requirements, as established by the FAA, for commercial pilots since 1970.
Thank you for contacting Data.gov,
Data.gov primarily displays U.S. Government data submitted by federal agencies. Information about "changes in pilot training" will be available if a U.S. federal agency has submitted such information in the form of a dataset to Data.gov.
You may contact: Tim.Perez@faa.gov, Federal Aviation Administration open data contact and Daniel.Morgan@dot.gov, Department of Transportation open data lead for recommendations.
The following link may also support your search: https://www.faa.gov/training_testing/training/fits/