Yes, early build included air bottles in the wing for an engine start. I believe they were not a great success and disappeared quite quickly. Standard air start inlet was under no.3. This was also the first in the start sequence, so groundcrew had to uncouple underneath a running engine. So some airlines installed an inlet on the rear port fuselage, behind the cabin door. This was a much better option, but NOT all airlines paid for this mod. so not all aircraft had it. Various APU options were discussed to get over the need for an air start unit at route fields; I am not aware of any great success.