Totally dedicated bomber squads died back near the end of beta, and the beginning of the regular Aces High, due to the playability imbalance in effect at that time.
At that time buffs were being shot out of the sky at will. Aces High has since changed the damage model on the bombers, changed the 50 cal guns, and made some other flight modifications that make flying buffs a lot of fun again. Now you often find yourself trying to deal with a damaged bomber on the way to the target as opposed to the old days when it was hit hit hit bang wing gone.
In spite of these changes I think it would be really tough to get a totally dedicated bomber squadron going again. In spite of the new changes it's tough to keep a dedicated bomber squad together when it's so hard just to get enough good fighters to properly escort you to the targets and back. Most bomber pilots get a bit bored just bombing all of the time and like to fly fighters too.
I think the very best bet is to join one of the large squadrons, like my beloved JG2, that have a group of pilots ready to fly bomber or jabo missions with fighter escorts. A good dedicated bomber pilot could really get a group of bomber pilots going from within such an existing squad and have fighter escorts to boot. Additionally, you will have a built in squadron ready to fly historical missions, which almost always include some sort of bombing, as such historical events become more popular.
Just my thoughts.
Ranger Bob
