EVENING TRIBUNE, San Diego, May 21, 1918

* 1st regular airmail airplane U.S. service
* 1st airmail stamp delivery

Page 2 has a one column heading: "GETS LETTER BY AEROPLANE POST" (see image) Surprisingly this issue is in good condition being from the "wood pulp" era. Very hard to find issues that are not totally fragile from this era in paper. Rare as such.
Complete with 14 pages, small library stamp within the masthead, small library label on the front page, generally very nice.