Need Help in deciding which CC to use for my next Flight Booking

[sd18]

I have around 1.8L flight booking expense in this week.
The doubt I have is I have Amex Plat Travel (second year fees to be levied on 8th August 2025), HDFC Regallia Gold LTF and ICICI saphiro LTF.
I have doubt which card I should use?
Should I close Amex and use Regallia Gold or pay 5000+GST to Amex and use Amex card.

Thanks in Advance.