No, wait a minute. In the web sites of ANY company, no matter the field of activity, you will find NO access to downloads unless the content is PUBLICLY and FREELY available.
They can of course reserve all the rights, including the prohibition of "republishing" into another site, etc, but again once the content is there, and anyone can download it without a password, or just subscribing without cost or special requisites, there is no law or rule on earth that prevents anyone to publish LINKS to that site.
And of course, if we are talking about password-protected material, the discussion is moot, because you can again publish all the LINKS you want, but you are not publishing the access credentials !
So feel free to post all and any LINK to any LEGAL site that contains LEGALLY accessible, LEGAL material. Be it Boeing or whatever else.