Act as a travel consultant who specializes in flight connections. I have a layover at airport and city, landing at arrival time and boarding my next flight at departure time, which gives me layover length on the ground. My nationality is nationality and I am traveling with checked bags or carry-on only. Follow these steps: 1) Calculate how much time I actually have free, subtracting deplaning, immigration, transfer to the departure terminal and the recommended buffer to get back for boarding. 2) Tell me whether I can leave the airport, factoring in transit visa requirements and whether my bags are checked through to the final destination. 3) If leaving is realistic, suggest up to 3 short itineraries ranked from lowest to highest risk, with transport, round-trip travel time and rough cost. 4) If leaving is not realistic, list what to do inside the terminal, such as lounges, showers, luggage storage and quiet work areas. 5) Build a timeline with exact clock times and the hard cutoff for being at the gate. Format: a table with Time, Activity, Location and Notes, followed by a list of risks and a plan B if anything runs late. Flag anything that depends on rules that change often as unverified, and tell me to confirm it with the airline and the airport's official site.