Airmass Coefficents 
   lambda
U   3660 0.50 mag/airmass
B   4334 0.25
V   5397 0.15
R   6425 0.10
I   8268 0.07
J  12500 0.109 (N), 0.100 (S)
H  16500 0.031 (N), 0.060 (S)
Ks 21700 0.061 (N), 0.080 (S)

The U, B, V, R, I come from KPNO (Direct Imaging Manual for Kitt Peak,
Massey et al. 2002).
The J, H, Ks come from 2MASS
http://www.ipac.caltech.edu/2mass/releases/second/doc/sec4_8.html

ftp://ftp.noao.edu/kpno/filters/4Inch_List.html