What time is your flight departing - it's often a couple of hours AFTER you need to 'check in'?
Are there any restrictions on what you're allowed to take on a flight to Jordan with you?
I think I'd be inclined to at least carry some of those 'breakfast replacement cereal biscuits' in your handbag - something like Belvia would be 'nutritious' IF you like them. We take those with us on long, early morning coach trips as OH won't eat anything at all before setting out.
Would you perhaps feel like eating something like a 'home-made version' of a 'fruit corner' before departure time?
What about a mixed salad in a container with some chopped chicken in a bag inside it - you'd probably need one of those foldable chill bags to put it in - but that could then be collapsed down to go in your hand luggage.
How about a container of couscous?
Good luck - I travelled to the States and back last summer during a very strict diet regime - finished up at McD's in the Airport having a Grilled Chicken Salad without the dressing

. Then selected the lowest calorie option on the flight - but it
was a scheduled flight with all catering/drinks provided in the price.