It is unknown, however there are antidiscrimination projects in place for this
It reports of regular receipt of report on complaints including discrimination but not discloses the values.
pg. 39
"Regular receipt of reports from Delta’s Corporate Audit team on complaints, allegations and incidents related to sexual and other forms of harassment and workplace discrimination"
pg. 41
"In the midst of a global reckoning over racial inequity and injustice that began in 2020, we began an honest, open conversation about where we are as a company and where we need to be to fulfill our commitment to be an anti-racist, anti-discrimination organization. "