The AAMC listing has so many inconsistencies with the mjor one being that it is basically a Bruggmann listing. Indeed he is the father of Philippine aerophilately but he is not Philippine aerophilately. His listing, if I may be blunt about it, is self-serving. Not a catalog but a seller's list only.

You could say that this is a fine tuned AAMC list. The assignment of catalog numbers is consistent Series flights like the 1927 flights to the Southern Islands arranged to what I think is the right sequence based on dispatch dates and arrival postmarks. I purposely left out catalog values. I believe that proper valuation can be best achieved by a panel of collectors and not by one individual.  The list is also not based on the Chiong collection alone. For the past twenty years I have  kept tabs on flight covers even though I never collected them. In fact they are the only collector prepared items that like. 

I am giving birth to the initials "FNC" which is for FOOTNOTE COVERS. These are flight covers worthy of note but I personally do not think they merit catalog numbers. The first FNC in my list is AAMC 1Ab.  It does not make sense to assign a catalog number to a flight cover with "NONE KNOWN TO EXIST."

In my listing the AAMC numbers out of the window. Likewise I assigned numbers to covers flown from Point A to Point B. Covers that were in part coursed by surface either from point of origin or to point of destination are documented as FNC. So the 1926 Aparri to Manila of the Madrid-Manila flight is no longer number 11 in my list. I know that this will be frowned upon by many. There will be an uproar. Disturbing a recall is just like stepping on a ant hill. In time you will be calmed, you will adjust, you will hopefully accept and adopt. My intent is pure patriotic. Philippine numbers for Philippine flights. It makes sense! Linda Stanfield produced a catalog on Republic flights with "RP" prefix. As her student my numbering with the "PI" prefix. The AAMC unrecorded or unlisted flights in my list validated to have been flown be they be in the name of Bruggmann or not.

Thank you.

aql
o o 1911 JAN 23 BUD MARS o Manila Carnival flights No flown covers
PI-1 NR 1914 APR 15 PASAY MANILA Demo flight, addressed to Nueva Ecija TOM GUNN. Ruth Law forerunner
PI-2 1 1919 APR 04 MANILA MANILA Flight around Manila RUTH LAW. Dropped souvenir card
PI-3 1A 1919 NOV 25 MANILA  CEBU o Philippine National Guard. 1 Known
PI-3a 1Aa 1919 NOV 28 ILOILO  MANILA oo Two Known
FNC 1Ab 1919 NOV 28 CEBU  MANILA o "NONE KNOWN TO EXIST"
--- 2 1919 NOV 28 ILOILO MANILA o Duplicate of 1Aa. Croft not Philippine Nat. Guard
PI-5 2A 1920 JAN 17 MANILA MANILA Flight around Manila, dropped cover GLIDDEN. Red "AEROGRAM" cachet. Four known
PI-5a --- 1920 JAN 17 MANILA MANILA Flight around Manila, dropped leaflet GLIDDEN. Red "AEROGRAM" cachet. Three known
FNC o 1920 JAN 17 GLIDDEN  o o Official stationery, red or black cachet
PI-6 2B 1923 APR 13 ILOILO MANILA o Two known
ADDITIONAL NOTES: 
PI-1: Like Ruth Law, documented to have carried a mailbag on their demo flights around Manila.
PI-3: Documented as the FIRST REAL AIR MAIL FLIGHT IN THE PHILIPPINES.
AAMC 2: Duplicate list of AAMC 1Aa. If AAMC 2 is considered different from AAMC 1Aa because they are signed by Croft, then the AAMC should have assigned separate catalog numbers to the other signed flight covers as well. Alfred Croft was not seconded to the Philippine National Guard. Major Stevenot invited him to come to the Philippines as a flight instructor for the first group of Filipino would be pilots.