There is a web site that has a complete US Airmail collection posted. Each page can be downloaded as a PDF. And, if you read the details of each issue, there is a lot of postal rate information included. Maybe this will be of some help to your search.
If you can find a copy of the Scott Specialized Catalog of United States Stamps and Covers, the domestic letter and air mail rates are included in the introduction.
I haven't found a similar chart with air mail rates online.
EDIT: David, I just sent you a PM about this. Steve
To send a PM ou can either click on the icon with the envelope and letter above the post of the person that you want to email or you can click on that person's user name and when their profile comes up select the send an email link.
PMs that have been sent to you should appear in your email program; however, I don't think that the forum email has been working for the last few days as I haven't received PMs that were sent to me and you likely haven't received the one that I sent to you earlier today.
As a workaround, please send an email to me at sjtomisek AT verizon DOT net and I'll provide you with the U.S. domestic air mail rates.
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