[illuminati airflow_pex]$ mkdir wheels
[illuminati airflow_pex]$ pip wheel --no-cache-dir --wheel-dir=./wheels airflow
...
[illuminati airflow_pex]$ pex --no-pypi --find-links=./wheels airflow -c airflow -o airflow4.pex -v
...
[illuminati airflow_pex]$ unzip -l airflow4.pex |grep -i Flask_Cache
       73  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/DESCRIPTION.rst
      993  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/METADATA
      845  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/RECORD
       92  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/WHEEL
     1065  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/metadata.json
       12  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/Flask_Cache-0.13.1.dist-info/top_level.txt
    24578  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/flask_cache/__init__.py
      473  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/flask_cache/_compat.py
     6160  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/flask_cache/backends.py
     2561  07-26-16 17:19   .deps/Flask_Cache-0.13.1-py2-none-any.whl/flask_cache/jinja2ext.py