But its from my experience la...(during last raya return flights and coming 26th flight)...
i usually travel with ma wife & kid and flying frequently KL-KK....So being cheapsket, ill strategies my booking like these

:
Whenever there is cheap tickets, i just bought and pay the tickets without all other optional services (i.e. advance seat, baggage, meals)...
So if for some reason we couldnt fly on the booked date, i dont lose too much money to forgo the tickets....
Only if confirm, then i will add baggage, meals and advance seat (if necessary)....
NOTE:for meal you need to book 48 hours before flight...I also web check-in immediately after paid the ticket (previously 7 days before flight date) without any in-flight service....Why???
Coz when check-in early, there is high tendency you will be seated next to each other (if you travel more than one person in the same itinerary)....
This kinda necessary when u travel with family & kids... so i will save money for advance seat...
Otherwise your seats will be scattered around (system auto allocate)....
If after self check-in i change/upgrade any in-flight service, i just reprint the boarding pass accordingly....
Ah ok, thanks for the thorough review. I'll keep this in mind.
I'm always so silly to book the luggage, meal and what not because i didn't know i could do it at a later time when AA's server is less busy.