Python has supported using dynload_shlib (using dlopen) on AIX since https://github.com/python/cpython/commit/c19c5a62aef7dce0e8147655b0d2f087965fae75 in 2003. While I have not found a definitive timeline of when AIX gained support for dlopen, I have found references going back to at least 2000. Considering this is now 20 years later and all supported AIX versions support dlopen, I suspect nobody has used or tested this code path in quite some time. I propose removing this support under PEP 11.