What's a grand iOS app for whipping up a quick presentation on my phone when I'm, like, stranded in an airport in Kuala Lumpur?

Right, so picture this: I'm stuck in KL airport, my flight's delayed, and I need to tweak my presentation for that tourism board meeting. Absolute nightmare, yeah? Luckily, I had Microsoft PowerPoint on my iPhone. It's a proper useful app for creating and editing presentations right on your phone. I could quickly add in some updated stats and even rehearse my speech while waiting for my flight. What's brilliant is that it works offline too, so doesn't eat up your roaming data if you've downloaded the files beforehand. It's saved me in a pinch more times than I can count, especially when Wi-Fi is dodgy or non-existent in some rural corners of the world. Honestly, it's a lifesaver for a travel blogger like me!