I’m a US citizen flying thru London and Delhi to Kathmandu on separate tickets. I am flying in Delta Airlines from NY to Delhi then Air India from Delhi to Kathmandu. My concern is do I need transit authorization document or transit visa in London or Delhi. Can I check in bag in NY and directly pick up in Kathmandu though I am flying in different airlines? Please advise 

Ticket kini sakeko ho ki kinna baki ho? Normally duita airlines bhaye pani connecting flight ho bhane back check in feri garna pardaina. Tyo boarding pass line bela ka samma ko tag dincha tyo here pachi tha huncha. Normally KTM samma kai tag dincha.

London ra Delhi ma ghumne bichar cha ki connecting flight matrai ho? Tyo jankari nabhainjel samma visa ko kura garna sakinna. Tehi pani UK ta US ko pomeranian na ho, visa chaiye pani di halcha ni. Bharat ko ta kurai nagare bho. Tara ticket leko chaina bhane chai save yourself from BS and avoid travelling via India.