Let $ABC$ be a Poncelet triangle, $A_1$ is the reflection of $A$ about the incenter $I$, $A_2$ is isogonally conjugated to $A_1$ with respect to $ABC$. Find the locus of points $A_2$.
1. **Define the problem and setup:**
   Let \(ABC\) be a Poncelet triangle, \(A_1\) be the reflection of \(A\) about the incenter \(I\), and \(A_2\) be the isogonal conjugate of \(A_1\) with respect to \(\triangle ABC\). We need to find the locus of points \(A_2\).

2. **Identify key points and lines:**
   - Let \(P\) and \(Q\) be the foci of the ellipse \(\omega\).
   - Let \(O\) be the center of the circumcircle \(\Omega\) of \(\triangle ABC\).
   - Line \(AI\) meets \(\Omega\) again at \(D\).
   - Let \(L\) be the midpoint of \(A_1A_2\).

3. **Construct auxiliary circles and points:**
   - Let the circumscribed circles of \(\triangle APD\) and \(\triangle AQD\) be \(\odot O_1\) and \(\odot O_2\), respectively.
   - Line \(PQ\) cuts \(\odot O_1\) and \(\odot O_2\) again at points \(N\) and \(M\), respectively.
   - The pedals of \(\odot O_1\) and \(\odot O_2\) on line \(PQ\) are \(S\) and \(R\), respectively.

4. **Establish the isogonal conjugate relationship:**
   - It is known that \(P\) and \(Q\) are isogonal conjugates with respect to \(\triangle ABC\).
   - Claim: \(D\) is the spiral similarity center of \(P, Q\) and \(A_1, A_2\).

5. **Prove the claim:**
   - The spiral similarity center of two pairs of isogonal conjugates of a triangle lies on its circumcircle and is the isogonal conjugate of the Newton line of the four points.
   - By homothety at \(A_1\), \(IL \parallel AA_2\).
   - Since \(AD\) and \(AA_2\) are isogonal lines of \(\angle BAC\), \(D\) is the desired spiral similarity center.

6. **Analyze the parallelogram and tangents:**
   - Note that \(APA_1Q\) is a parallelogram.
   - Simple angle chasing shows that \(A_2P\) and \(A_2Q\) are tangents to \(\odot O_1\) and \(\odot O_2\), respectively.

7. **Use fixed points and constant relationships:**
   - By the power of a point theorem, \(MI \cdot IQ = AI \cdot ID = NI \cdot IP\), so \(M\) and \(N\) are fixed points, and \(R\) and \(S\) are fixed.
   - Since \(\odot O_1\) and \(\odot O_2\) pass through a fixed point \(O\), there exist constants \(x, y, \overrightarrow{z}\) such that \(x\overrightarrow{O_1S} + y\overrightarrow{O_2R} = \overrightarrow{z}\).
   - This indicates there exist constants \(x', y', z'\) such that \(x' \cot \angle A_2PQ + y' \cot \angle A_2QP = z'\).

8. **Conclude the locus:**
   - Therefore, \(A_2\) lies on a fixed line.

\(\blacksquare\)

The final answer is \( \boxed{ A_2 } \) lies on a fixed line.