Earlier in my transition I air dried, but after a while my hair wasn't having that. I transitioned for 18 months, and I straightened for about the last 9 months or so. I actually didn't flat iron then (never was a flat ironer when relaxed -- didn't get one until I went natural), but I did blow dry with a brush attachment. So I'll share both regimens.
Transitioning:
1x per week
1. Rinse hair, apply Burt's Bees Avocado pre-shampoo treatment for at least 30 minutes.
2. Shampoo w/Jason Natural Biotin shampoo
3. Deep condition w/Jason Natural Sea Kelp conditioner (I was also doing a lot of pj-ing at this time, but my main moisturizing con was sea kelp).
4. Apply Giovanni Direct leave-in and Elucence Silk Hydrating Elixir to wet hair.
5. Blow dry in sections w/hatchet style dryer w/brush attachment (it was like 1600 watts I think. I put it up on high).
My hair turned out better when I blow dried WETTER hair rather than dryer, for the reasons Dommo mentioned above. Also, my pre-poo & conditioning products were usually focused on moisture and softening the new growth so I could blend the two textures more easily.
Now (Natural):
1x per week
1. Pre-poo w/protein con (AO GPB currently) on dry hair for at least 40 minutes. Sometimes mix in Kim Vo Moisturizing Masque for extra hydration.
2. Shampoo w/Kim Vo moisturizing poo or Organix Coconut Milk poo
3. Condition w/Organix Coconut Milk or Vanilla Silk conditioner in the shower
4. Towel dry. Apply Kim Vo Brilliant Luster Glaze (clear rinse) and plastic cap/cellophane for 20 minutes.
5. Rinse, gently towel dry a bit
6. Blow dry w/Organix Vanilla Silk Blow Dry cream and hot air brush. I was applying Ojon leave-in before this, but I ran out, so I'm just skipping it now and applying a little Organix Coconut Milk anti-breakage serum to the ends first.
7. Apply Giovanni serum & flat iron w/Sedu (I have a 1.5" and a mini styler -- I just plug them both in and grab whichever one is appropriate depending on the piece of hair). I do the comb chase method w/a carbon comb I got at Sally's. I tried it with a regular comb at first and the teeth are all melty and jacked up now. So um, yeah, do get that heat-resistant comb if you decide to try this method
My regimen now is focused on balanced strengthening because I'm using a lot more heat. GPB is protein, but not harsh; Coconut Milk is the "nourishing" line from Organix and has some light milk and egg proteins, but again not harsh. My Kim Vo products are moisturizing to balance it out as well.
Attachments: 1.Half and half hair during transitioning days 2. After finishing method described above for transitioning. 3. Natural hair after blowdrying w/hot air brush 4. After flat ironing with comb chase method