Took about 20 DS games and a handful of GBA
Bought a PSP on the flight to Cali here in Dallas airport....in a SONY Vending machine

i regret not having one for flight
What i had on me in no particular order
Contra 4
Zelda Phantom Hourglass
Ultimate Mortal Kombat 3
Gunstar Heroes - GBA
I had a good few others like Meteos, New SUper Mario, Metroid.....lots of great titles
but those 4 were what kept me busy most fo the time. - I have the first Castlevania for DS and i really enjoy that one.
There is a Street FIghter 2 V for the GBA out. My friend got it in Singapore but im sure you can find it from the "sources". EXCELENT game for the GBA....old school SF days. Real sweet.
The micro is out of production but you can still get them on Amazon or Ebay i believe. I was checking out a classmates own the other day.....real sweet dred...so tiny