firstly, I want to build up my airforce. I have detached air units (interceptors/bombers) to make them sepeartely selected but not sure to bunch them up with other units, which are the same. I am left with about 30 different interceptors which need to be selected individually, rather than selcted in several groups.
secondly, I am researching Jet engines. When this technology has been researched, will my fighters automatically be upgraded or will I have to build new units to take advantage of the technology? If they are upgraded, is there a certain amount of time this process will take?