If you are looking for newly deleted three letter .com domain names, keep an eye on RZT.com.
The world's shortest known registered three letter .com has expired, been discarded and is now in a DropCatch auction with a price of $16,001 for the first 3 hours of the auction and a closing price of $18,001. Whitten Rice is the winner.

One has to wonder how and why a valuable domain like RZT.com was not renewed!
RZT.com was registered in 2009 and it was registered at Sav.com before it dropped. However, this was not its first registration and release.
RZT.com was originally registered in 1999 by a company called ResortQuest International and was canceled in 2009.
Historical WHOIS records provided by DomainTools show that domain investor Stanley Pace owned the RZT.com domain in 2011.

The most recent registration was on May 13, 2024, just after a WHOIS search.
Three-letter .coms have not been as popular as they used to be in recent years, and some time ago three-letter WMC.com likewise dropped due to non-renewal and was eventually auctioned off for $62,500.
Source: domaingang