Tested my blood sugar it is fine.
I used test which take glucose level for past one month period. The result was 4.5
ketone level of 1+ is not very high, though it is detectable. The fact that your blood sugar is totally normal at 83 means that the ketones you saw are from what is known as 'nutritional or metabolic ketosis'. This is not dangerous, in fact it is normal and a healthy response of the body to fasting, or to eating high fat low carb meals.
When you fly be sure to drink plenty of water. Flying, with the dry air, is very dehydrating.