I mostly blame the lack of Integration with reservation systems in certain carriers like Indigo, Nepali Airlines, Air Asia, etc. Then there is a whole range of

I mostly blame the lack of Integration with reservation systems in certain carriers like Indigo, Nepali Airlines, Air Asia, etc. Then there is a whole range of smaller carriers (including Nepal's numerous airlines). Some airlines are downright now searchable through any means other than the airlines own web site.