Well, my answer might differ from what Rob would say but:@Bob69bob do you think a SC+Dice combination would hurt the drop percentages?
I try to save the fuel for adventure, QL and alliance flights where I really need it.
For maps (i.e. flying to adventure destinations) I do another trick - I send all my planes to some destination either in the evening or first flight in the morning, then once they arrive and before collecting the drops I activate Dice, tap on the arrived planes, send them back to the same destinations and use one Catalyst per plane to make them arriving once again within the duration of the Dice. So I can fly in my case 26 flights with a single Dice. To collect 2 to 3 maps per destination it usually is enough to fly between 3 and 5 waves (78 to 130 flights). I open the maps chests once I collect at least 5-10 of them.
In this case for only 26 flights it is not worth to activate SC. Activating Dice for flight items I've done very rarely so can't remember anything about the drop rates (indeed, it just pops up in my mind - when I recently few blue cards destinations, as usual with SC and GD I needed few more from both Spare Wire and Additional Radar, so I activated Dice on top on the above two bonuses and sent my Jets to Canary Islands or Rio - the drop rate was nearly 100% or at least 4 drops from five simultaneously landing planes).