Some of the $n + 1$ cities in a country (including the capital city) are connected by one-way or two-way airlines. No two cities are connected by both a one-way airline and a two-way airline, but there may be more than one two-way airline between two cities. If $d_A$ denotes the number of airlines from a city $A$, then $d_A \le n$ for any city $A$ other than the capital city and $d_A + d_B \le n$ for any two cities $A$ and $B$ other than the capital city which are not connected by a two-way airline. Every airline has a return, possibly consisting of several connected flights. Find the largest possible number of two-way airlines and all configurations of airlines for which this largest number is attained.
1. **Understanding the Problem:**
   - We have \( n + 1 \) cities, including the capital city.
   - Cities are connected by one-way or two-way airlines.
   - No two cities are connected by both a one-way airline and a two-way airline.
   - There may be more than one two-way airline between two cities.
   - \( d_A \) denotes the number of airlines from a city \( A \).
   - For any city \( A \) other than the capital city, \( d_A \leq n \).
   - For any two cities \( A \) and \( B \) other than the capital city which are not connected by a two-way airline, \( d_A + d_B \leq n \).
   - Every airline has a return, possibly consisting of several connected flights.

2. **Objective:**
   - Determine the maximum number of two-way airlines in a day.
   - Find all configurations of airlines for which this maximum number is attained.

3. **Analyzing the Constraints:**
   - Let \( C \) be the capital city.
   - Let \( A_1, A_2, \ldots, A_n \) be the other cities.
   - For each city \( A_i \) (where \( i = 1, 2, \ldots, n \)), \( d_{A_i} \leq n \).
   - For any two cities \( A_i \) and \( A_j \) (where \( i \neq j \)), \( d_{A_i} + d_{A_j} \leq n \) if they are not connected by a two-way airline.

4. **Maximizing the Number of Two-Way Airlines:**
   - Consider the capital city \( C \) and its connections.
   - The capital city \( C \) can have connections to all other \( n \) cities.
   - Each of the \( n \) cities can have at most \( n \) connections, but since they are connected to the capital city, we need to consider the remaining connections.

5. **Constructing the Configuration:**
   - Connect the capital city \( C \) to each of the \( n \) cities with a two-way airline.
   - This gives us \( n \) two-way airlines.
   - Now, consider the remaining connections among the \( n \) cities \( A_1, A_2, \ldots, A_n \).

6. **Ensuring Maximum Connections:**
   - To maximize the number of two-way airlines, we need to ensure that each city \( A_i \) has as many connections as possible without violating the constraints.
   - Each city \( A_i \) can have \( n - 1 \) connections with the other \( n - 1 \) cities.
   - However, since \( d_{A_i} + d_{A_j} \leq n \) for any two cities \( A_i \) and \( A_j \) not connected by a two-way airline, we need to carefully distribute the connections.

7. **Optimal Configuration:**
   - The optimal configuration is to connect each city \( A_i \) to the capital city \( C \) and then distribute the remaining connections among the \( n \) cities such that the constraints are satisfied.
   - This can be achieved by creating a complete graph among the \( n \) cities, where each city \( A_i \) is connected to every other city \( A_j \) with a two-way airline.

8. **Calculating the Maximum Number of Two-Way Airlines:**
   - The capital city \( C \) has \( n \) connections.
   - Each of the \( n \) cities \( A_1, A_2, \ldots, A_n \) has \( n - 1 \) connections with the other cities.
   - The total number of two-way airlines is given by the sum of the connections:
     \[
     \text{Total two-way airlines} = \frac{n(n-1)}{2} + n = \frac{n(n-1) + 2n}{2} = \frac{n^2 + n}{2}
     \]

The final answer is \(\boxed{\frac{n^2 + n}{2}}\).