> Airlines Airplanes are cool, so people keep pouring time and money into it, but the airline industry as a whole has made a cumulative loss during its 100-yea

> Airlines Airplanes are cool, so people keep pouring time and money into it, but the airline industry as a whole has made a cumulative loss during its 100-year history[1]. It's better to avoid any startup idea related to airlines. > Basic Infrastructure (e.g.,clean water, well maintained roads, sound bridges, beautiful parks) Ugh, local/state government with petty politics, corruption, insane levels of bureaucracy. Stay away as well. > domain information groper Have you seen the typical web service that provides information like that? It's either someone's hobby project, in which case they'll tire of maintaining it and paying bandwidth, or it'll turn into a spam-infested site like whatismyipaddress.com. You could make a good free tool, but you can't make honest money on those. On a related note, no one has been able to find an honest way to make money on caller-ID lookup (telephone directory lookup). Useful phone lookup did exist in the early web days, but today they are all unreliable, spam-infested, dishonest sites. The information on some sites is literally 100% fraudulent, giving fake names and addresses for every possible phone number. If it were possible to provide an honest, useful, and profitable service, it would be the top Google listing every time you searched for a phone number; the fact that it doesn't exist, means that it is not possible[2]. [1] https://en.wikipedia.org/wiki/Airline#Economic_considerations https://en.wikipedia.org/wiki/Airline#Economic_consideration... [2] A significant factor is probably due to the lack of useful phone number databases since individuals and telecom companies want to keep their numbers private. But this can't be the entire answer since at least 80% of landline numbers are "published", but even landline lookup has become useless.