According to people who work with an industry working group that the Federal Aviation Administration set up last year to study the use of portable electronics on planes, the agency hopes to announce by the end of this year that it will relax the rules for reading devices during takeoff and landing. The change would not include cellphones.

One member of the group and an official of the F.A.A., both of whom asked for anonymity because they are not allowed to speak publicly about internal discussions, said the agency was under tremendous pressure to let people use reading devices on planes, or to provide solid scientific evidence why they cannot.