This is my interpretation of the piano chords for Air, transcribed for guitar. They 
right to me, but they might be off a bit. Just mess around with 'em, and you should get it.


I think he plays the same riff throughout the song...opening, verse, chorus, etc.

Part 1
e|-----|-----|-----|
B|-(3)-|-----|-----|
G|--5--|--4--|--5--|
D|--5--|--5--|--7--|     x2
A|--3--|--5--|--7--|
E|-----|--3--|--5--|

or
    C     G    Am
e|-----|--3--|--0--|
B|--1--|--3--|--1--|
G|--0--|--0--|--2--|
D|--2--|--0--|--2--|    x2   Doesn't sound as good to me, but whatever.
A|--3--|--2--|--0--|
E|-----|--3--|-----|

Part 2
e|-----|-----|-----|-----|-----|
B|-----|-----|-----|-----|-----|
G|--9--|--7--|--7--|--7--|--5--|
D|--x--|--0--|--0--|--0--|--0--|
A|--7--|--x--|--x--|--x--|--x--|
E|--8--|--7--|--6--|--5--|--3--|


There are some added little notes in there you can add if you want, but that the basic 
of it.