Can’t drop an airport

You are correct that you need an unlock in your Petrolium HQ (http://ca.ign.com/wikis/simcity/Petroleum_HQ)

Requirements to unlock: Extract 9,600 barrels of oil in a single day

Some tips:

• make sure that export is enabled for every trade depot -- it won't be enabled by default.

• the oil well is 2,400 barrels/day and each pumpjack is an extra 1,200 barrels/day. So you are going to have to get 6 extra pumps in somehow.

If your city is out of power for whatever reason it seems to take a while after you get a power plant online for power to reach the entire city. First a power plant has to get workers, then after that it seems to take a while before it actually starts supplying power.

Buying power from other cities may be buggy. I played a city for several hours buying power from neighboring cities; then saved and reloaded that city the next day only to find the city without power despite power still being available in the region (it is possible that not enough power was available) so I broke down and built a power plant and observed the city slowly get powered up.