My next category of airmail borders is Lines & Bars. This grouping, while having multitudinous variations, is a little prosaic so I have chosen one that is to the other extreme, an anomaly. Collecting cancels from towns with unusual names was popular in the 1930s, and this cover with its hand drawn border was designed to play on the Four Corners, Wyoming, town name. Using four 1 1/2 cents stamps to make the then current airmail rate of 6 cents doubled the play on the town name. While I have no evidence, I think that the addressee made this cover and mailed to himself.
My next airmail border collection category is Bottom Bars, a sub-category of Lines and Bars. Bottom Bars usually include an airplane or other symbol in the design which is along the bottom edge only. This one has a nice image of a Boeing 314 Clipper first used on the Trans-Atlantic routes beginning in 1939 with the cover being used, in this case, for a domestic first-flight in 1941.
The posts by de61 and philatelia in this thread has rekindled my interest in my airmail border collection. This one is from the category I call "one-of-a-kind," that is I have not found others of similar designs to group with it. This cover has a Halloween motif with an owl or bat sitting on a crescent moon that was pressed into service as a first-flight cover. There are multiple examples of interesting designs in this category, but I will post only one for now. I'll come back to it after posting an example from each of the different categories I have.
From my category of airmail borders with variations on the traditional parallelogram or "lozenges" border. This one with a double row of smaller parallelograms on a cover commemorating the 30th anniversary of the Wright Bros' first flight. These look hand drawn, which is not unusual. Some collectors made their own airmail markings.
I never did figure out what MACC stood for. An airport dedication cover from my Minnesota postal history collection.
This cover makes me a little sad. Back in the 60's-80's, Anchorage was the major hub for flights going from Europe to the far east. When the USSR fell Russia began allowing planes on a limited basis to fly over Russia (which the USSR did not) so all that business left Anchorage.
Paraguay airmail envelopes feature their colors (red, white and blue).
MACC in the border of the stars and aircraft border are the initials of the Metropolitan Airmail Cover Club formed in New York City in 1941. It later became the Metropolitan Air Post Society or MAPS. It looks like the society may still be active, but I don't see any dates on its home page. mapsnewyork.org/home.html
At first the border got my attention. It looks badly printed, not home-made.
The postage due is no less mysterious. With a 1949 stamp for 40 centimes and marked for air mail, it is underpaid, and assessed for 25 centimes more on delivery. This helps with the invisible cancelation year. That must be 1953 or after, after the Swiss trans-Atlantic air mail rate fell from 80 to 65 centimes.
How the New York clerk came up with 8 cents due is beyond me. With the exchange rate then pegged at CHF 4.375 to the dollar, the 25 centimes due would equal 5.7 cents. Sometimes receiving clerks doubled the amount, to be punitive. Something going on I don't get.
The next category in my airmail border collection is what I call "partials," that is the airmail designtion does not extend around the envelope, but is placed in one of the corners or along one or two of the edges. Some are hand drawn such as this one addressed to the executive secretary of the Jack Knight Air Mail Society. This cover includes hand drawn stamp frames in addition to the attractive airmail designator to the right of the address. Unfortunately, I don't know the artist, perhaps, Clarence Myers who signed the cover.
From my collection of variant airmail border is this first-flight helicopter mail on route AM 84 with the border composed of red, white & blue half circles. The design is repeated on the reverse along with a copyright notice implying that envelopes with this border were not philatelically inspired, but were produced commercially and available in stationery shops. The cachet includes a recognizable rendering of the first commercially produced helicopter, a Sikorsky S-51.
I'm interrupting my airmail borders categories sequence to show this recent acquisition. I have been trying to add this design with helicopters on the top border and rickshaws on the bottom to my One-of-A Kind category for several years now. I saw one on eBay about fifteen years ago, but it was priced too high for me. A second appeared some years later, but I was outbid on it. I finally got this example a couple of weeks ago. It appears to be a commercially printed airmail envelope and I doubt that it was originally scarce. Commercial airmail stationery was usually used for personal or business correspondence and, consequently, of little philatelic interest and thus not saved. As I recall the other two covers I saw originated in Japan as well and this stationery may not have had wide distribution. I am grateful to finally have an example of this design for my airmail borders collection.