These new bombshell allegations from Boeing whistleblowers about what happens to faulty plane parts are pretty horrifying

• A new report from the Senate subcommittee contains fresh allegations from a Boeing whistleblower.
• Sam Mohawk, a quality assurance investigator, says the 737 program lost track of hundreds of bad parts.
• Boeing's CEO, however, said on Capitol Hill he remains "proud" of the company's safety record.

The Senate subcommittee investigating Boeing's safety and quality practices on Monday released a new report — and it contains new allegations from company whistleblowers about what happens to faulty plane parts.