This time I think that we should be negation for clear this problem not debate.
I think that HITT is your customer you should responsible for cost of air freight. Although air freight cost is too expensive you must pay.
You said that “I will try” but you didn’t update delivery date confirmation to us.
In this case I would like to suggestion you responsible cost of airfreight for smooth business in the future.
I am will so deeply appreciate if you can pay AIR cost to us.