Took a while to hash this one out; apologies for the delay.
The following will be inserted into the start of the bullet-point section on p. 102:
• Space: A LAM in AirMech mode operates on the space map using the Space Drops for Ground Units in Zero-G Operations (see p. 22, SO) & Zero-G Ground Unit Combat (see p. 107, SO) rules, as if they were a BattleMech with a Thrust Rating equal to their AirMech Cruising MP/3, expending fuel normally.
As for bays, unless you have some sort of as-yet-undocumented vessel with specialist airmech bays, an airmech must transform and use either a fighter or mech bay. Traditionally that would have been a fighter bay, but of course they're flexible.