Coast Guard Aero Freq's: AM ?

[Robert11]

Hello:

Have the following Coast Guard frequencies, which I "think" are aero
related, and aero Search & Rescue.
(but not 100% sure)

Realize that just about everything above 30MHz that they use is FM, but what
about their aero stuff? AM ?

Specifically:

162.325
164.550
166.225

137.150
381.700

Are these AM ? If not, which ?

Is there a site that lists all C.G. freq's, and their modes ?
Have been able to find for their FM broadcasts, but nothing concerned with
aero. ?

Thanks,
Bob