What maps have Gunship and Cruise Missile available for Commander

The best/fastest/easiest way is, as Lyrion mentioned in a comment, to play on a capture-only server. This will give you a few thousands exp/minute, depending how good the people on the server communicate/play.

Example(16 vs. 16):

• 2 guys(1 per team) are capturing one point(or two), because they want some privacy or whatever
• Out of 15 vs 15 remaining, 7 on each side are afk and they left their soldiers at points A and B respectively. So there are only 8 people running per team. So at one side the capture will take a very long time(7 "defenders" and 8 "attackers" - same rate as if there would only be 1 attacker), and by the time teams will capture the points and run back, the flag will probably get neutralized before anyone of the team can make their way to it.
• That's pretty much the worst case scenario

So here's the best case scenario:

• Nobody is AFK
• Everybody runs as a group
• You only capture 2 points(A and B for example)
• Squad leader constantly gives orders to attack next flag

In this case you would earn a few thousands exp/minute

As of my experience, it is best to play and unlock upgrades in conquest large mode, since in these modes you will be able to find lots of air crafts to destroy.

Maps and spawn location:(these are conquest large unless specified)

• Seige of Shanghai: Has 2 MAA in Obliteration mode.
• Paracel Storm: 1 MAA, located at B
• Operation Locker: No MAA, no aircraft either.
• Flood Zone: MAA only in rush mode.
• Golmud Railway: 1 MAA per team
• Dawnbreaker: 1 MAA per team
• Hainan Resort: 1 MAA per team
• Lancang Dam: 1 MAA per team
• Rougue Transmission: One MAA will spawn at C after capture, one MAA per team (CQ Large and Obliteration)
• Zavod 331: 1 MAA per team

A word of advice, if you are looking for fast unlocks, when searching for a server type in keyword "instant" or "fast", and look for those that have "instant/fast vehicle respawns", the lowest it can be set at is 25% of normal respawn time, the lower the better. If you manage to get into an MAA on those servers you will feel like air crafts never stop coming.

Best maps for MAA:

• Golmud Railway: High visibility, no cover for air crafts
• Paracel Storm: High visibility, some cover for air crafts, risk being destroyed by c4
• Lancang Dam: High visibility, no cover for air crafts

PS: I play on PC, but I am almost certain that they are the same for consoles.