

Good news : they were all promo fares from different Ph budget airlines.
Bad news: still those were cash/money down the drain.
That's the curse of availing promo airfares.
You have to take advantage of the slots way too early (like a year ahead or min. 6 months earlier) before your target date. You take risk against whatever weather condition, health condition and social status you find yourself in on the actual date of departure. Promo fares are usually irrevocable of everything : no return/no exchange, non-transferable and you may only use them on the date you booked for, period. Meaning it's all up to you!
Ooops! Check the Cebu Pacific ticket above. Have you spotted the " may change until.." under booking details? I don't think that's for the passenger's advantage. Rather it's the other way around, I think it says, the airline management may change the date, not that the passenger has the right to change it. I had experienced it more than twice with a particular airline. They called me for adjustment of my flight scheds.
Sucks!