list thousands of world airports most you can fly into using 747 or 767 the smaller ones have long enough runways for 737's and most have ILS.
As an idea if you get stuck deciding where to fly to next ;what ive been doing is starting with the 1st airport listed under 'A' then flying to the next airport listed , from then on flying onto the next listed airport from the nearest airport on the list ive already flown to.So flights should get progressively shorter.
Ive been using the 763 for long flights and the 737 for shorter flights and for airports with short runways.
Ive had to make unscheduled landings three times,a emergency landing in Africa so i could get to work on time, and on another flight i had to stop for fuel.Ive also had to divert in Australia because of zero vis on a non ils approach.
By the time i get to Z ill be a