AMR Investment Services, which oversees $12 billion in retirement assets for American Airlines Inc., is beginning to look at its domestic equity managers with the potential to make some changes later this year, said William Quinn, president of AMR in Fort Worth, Texas. At issue is AMRs longstanding value-style bias. It is working with its nine domestic equity managers to determine whether managers should put more emphasis on future earnings of companies, he said. Between 50% and 60% of its total retirement assets are invested with its current domestic equity managers, he said. For example, AMR has a 5% exposure to technology stocks, while market indexes are close to 25%, he said. Managers would be looking at whether earnings growth in the technology sector is cyclical or sustainable. "Value managers do forecast, but are more comfortable with what is known, he said. "Are we doing enough looking forward? AMR, however, would not abandon value investing for growth, he said, adding that it was too early to tell what specific changes AMR would make. But it potentially could be "looking at firms who look at both sides (value and growth) with a little more vigor.