Guild Wars 2

I think it would be interesting to have an airship system in WvW.
Each team would have an airstrip, which served as an airship construction site.
Building an airship would cost a tremendous amount of supplies/money.
Once it was built, you could have it target a location to hover over.
It would be high enough above ground so that falling would kill you (you can’t get to vistas/ unreachable locations by jumping off).
It would act as a mobile siege base
Players could lower ropes at predestined locations as a way of escaping.
Airships would be able to get cannons and other siege equipment through upgrades.
Each airship would hover for a while at its location (about 5 minutes) and then return to the airstrip for repairs.
Launching the airship would cost resources each time, so airship strikes need to be planned carefully.
Teams could build anti-air cannons that are more effective against airships.
Enemy teams could board airships with grappling hooks.
Individual players could build small planes (costing quite a lot of supply) that could be used to scout or distract.
These small planes could only land at your team’s airstrip, preventing access to unreachable areas.
They could also land on your team’s airship, if it had the correct upgrade.
Friendly airships could be reached easily via a portal.
I think this would spice up WvW quite a bit, and add a new layer to sieging instead of just swarming a base.