October 26, 1984

The Civil Aeronautics Board approved airline schedule adjustments yesterday intended to reduce persistent flight delays that have not let up since the summer travel season. The more than 1,300 schedule changes, which take effect Sunday with the end of daylight saving time, affect flights arriving at or leaving the three major airports in the New York area and the major terminals in Chicago, Atlanta and Denver. These six airports have accounted for three-quarters of the record number of flights in recent months that have taken off or landed 15 minutes or more behind schedule. Peak-Hour Flights Affected The changes, which primarily affect flights that have been bunched together in the peak morning and evening hours, were worked out last month in eight days of meetings among the airlines. These negotiations among competing carriers required exemption from antitrust laws by the Civil Aeronautics Board, which yesterday approved the resulting agreement by a 5-to-0 vote.

The only thing that stands between ''Boo'' and Broadway is $1,250,000, and Anthony Moyer, the play's co-author and co-producer, was absolutely certain the other day that the show would go on. ''Boo'' has ''incredible subsidiary rights,'' he was saying. ''It will have incredible returns to investors.'' And finances aside, the play itself was - well, incredible. ''A lot of people have seen possession tales,'' he added, ''but in this, the demon jumps from nun to nun. So this provides an incredible piece of theater for four actresses.''

Companies I.B.M. will open a personal computer plant in Mexico , sources in Mexico City said. If the Mexican Government gives final approval, the company would become the first foreign microcomputer maker to set up shop without giving majority control to a Mexican partner. The total investment would exceed $300 million and the plant could produce 600,000 units over five years, mostly for export. (Page D1.) I.B.M. introduced many hardware and software products, putting new pressure on its rivals. (D3.) Braniff's severe retrenchment may only postpone its collapse, many analysts say, although the hobbled airline contends it is shrinking only to preserve cash until it can expand again in the spring. The Pritzker family, which recently took over the carrier, said it would keep trying for a revival. (D1.)

The dollar traded erratically yesterday, dipping at one point below the 3-mark barrier it first cleared in the second week of September. It was pushed down by unconfirmed reports that the West German central bank had intervened for at least the third time in a month to bring the dollar down from its recent high levels. After climbing to about 3.0450 marks before the intervention rumors, the dollar was sent tumbling to a low of 2.9975 marks in disorderly dealings. By the end of the day it had climbed back to 3.0210 marks, down from 3.0225 late Wednesday.

An article in Sports Pages yesterday about the National Football League's problems included a figure based on a miscalculation by league officials, which overstated the attendance increase this year. It is 0.9 percent.