Combining/Linking reservations/bookings of flight tickets of two people for the common part of the journey

My partner and I will be flying [to and from] Frankfurt to our separate home towns in India via Delhi through possibly different online agents.

The itinerary would look like this:

 1. FRA --(Lufthansa)--> DEL --Jet Airways--> Destination1 (+ Return) 
[Online Agent XX]

 2. FRA --(Lufthansa)--> DEL --Air India  --> Destination2 (+ Return)
[Online Agent YY]

Is there a way that we can combine or link the reservations for our common legs in our journeys?, i.e.,

 a. FRA --(Lufthansa)--> DEL

 b. FRA <--(Lufthansa)-- DEL

So that, in case of cancellation, delays, seat changes, upgrades, it affects us together.

I heard that speaking to the airlines (Lufthansa in this case) after booking helps, but would it also work for different destinations?

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How do I combine two plane tickets?

Just give the first check-in agent (at IAD on your outbound and at KHI on your return) your itinerary details of your second ticket and you should be able to through-check your bag all the way through even though there are two reservations and two separate tickets.

Can you link airline reservations?

2. Re: Can you "link" airline reservations made separately w/miles? Yes, you can, but it doesn't guarantee that you will be treated as one party. The most flexible way for you to get where you are going in a disuption would be as single individuals.

Can you link two separate flights?

A: It depends, but the general rule is NO. Some airlines will through check baggage onto separately ticketed flights, but some won't (even if both tickets are with the same airline). Some airlines will take pity if your delay is due to them, but others don't.

Can you book two tickets on the same flight same name?

Re: Is it illegal to book 2 flights under the same name? You can book and pay for as many flights in as many names as you like. The question is how much refund will you get for the tickets you are not using. There is absolutely nothing illegal with booking multiple tickets.

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