My hard drive is not accessible by airport express as its format is ntfs
AirPort Express will not support a hard drive at all.
My I Tb hard drive which has ntfs format is not accessible using airport extreme
If you are connecting the drive to the USB port on the AirPort Extreme, it will need to be formatted as FAT32 or Mac OS Extended (Journaled).
Sorry, but those are your options. This Apple support document confirms: