Where can Boeing wind data be found?
An alternative to the Boeing data (if it exists, you might need to call one of their sales reps to find it) is publicly available meteorological data.  One such project is the NCEP/NCAR Reanalysis Project.  There are a few others, as well as archived data.  None of these is exactly the Boeing dataset, but I'd bet that the Boeing dataset is based at least in part upon data like these.  The benefit to the data below is that in most cases it is free and there is a lot of it.  

Reanalysis Data

Reanalysis data is constructed from the best available past observations, which are assimilated into a weather model to fill in the gaps between obs and in time.  There are many such projects with various scales (global, regional) and time periods.

The NCEP/NCAR Reanalysis Project

This dataset has 4-times-daily, daily and monthly values between 1948 and present and long term monthly means for 1981-2010.  The data is global. The data is publicly available and you can retrieve files in NetCDF format from the linked website.  The wind data is stored on pressure levels (e.g. 1000 mb, 500 mb, 250 mb) and is stored in its u (east-west) and v (north-south) components separately.  

The ERA40

This dataset is a global dataset covering 1957-2002 and has various output resolutions available.  Output from ECMWF is typically in the GRIB format and not all of it is free for non-research use.

The NARR

The North American Regional Reanalysis, as the name suggests, is a regional dataset covering North America.  The data covers 1979 - present.

Observations

Long term past observations are archived at the NCDC and include surface stations, weather balloons and model data, among others.  From the various models available a statistical representation of winds could feasibly be produced.