CAN SOMEONE PLEASE ADVISE AT WHAT AGE AN AIREDALE BITCH COMES INTO SEASON FOR THE FIRST TIME?

She will come into season any time between 6 months and a year - most likely about 8 months. You're not planning on mating her so soon are you (looking at the topic title) - that would be a BIG mistake - it's best to wait until she is 2 years old before breeding from her, and then only if she has turned out to be a good enough example of her breed, and has passed all the relevant health checks.