  In- and out-of-plane London penetration depths were measured in single
crystals CaAlSi (T_{c}=6.2 K and 7.3 K) using a tunnel-diode resonator. A full
3D BCS analysis of the superfluid density is consistent with a prolate
spheroidal gap, with a weak-coupling BCS value in the ab-plane and stronger
coupling along the c-axis. The gap anisotropy was found to significantly
decrease for higher T_{c} samples.
